Powermac g5 7,3 drive bay fan: 2fan/4/7: drive bay error

Hello
I have a problem with my G5 Powermac. It is an G5 dual 2x2Ghz late 2004 7,3. 5 Gb. ram. Running Leopard. I am in a real trouble
A week ago, the system showed the black transparent screen of critic error ("press the power button for several seconds...") I started the system again and showed problems
I ran the hardware test disc. It showed "2fan/4/7: drive bay" error
Then I replaced the battery for a new one, then I reset the PMU and PRAM
Computer turned on. 15 min of normal use. It showed the error screen again.
Every time I reset the PMU, the fan works, but now it gets stopped in the gray window, and the apple logo is replaced by the "forbidden" icon
It´s a very complicated situation to replace this fan, because you have to disassemble the whole main board to replace the fan in the top floor (the drive bay) and I am not sure that it is a problem of the fan (plus, you have to find a second hand part, it is discontinued) and I think I could "hurt" the computer trying to replace it by my self
Sorry for my poor english. I´m from Spain
Any help will be appreciated
Thank You

I tried to boot it on safe mode this morning. It showed the forbidden icon on gray screen at startup. I waited for a while and tried again in normal mode. Booted perfectly and showed me the log about the crash. I place it here, but I can't give it format because I write from my iPod and it doesn't show the tools, only the text box:
Interval Since Last Panic Report:  2254 sec
Panics Since Last Report:          6
Anonymous UUID:                    063639A2-A1B3-4A98-8362-76E48FF06710
Thu May 12 10:52:10 2011
panic(cpu 0 caller 0x000AD128): simple lock (0x00453220) deadlock detection, pc=0x0003F910
Latest stack backtrace for cpu 0:
      Backtrace:
         0x0009CC88 0x0009D63C 0x00029DA0 0x000AD128 0x0003F910 0x00034384 0x00037594 0x00042490
         0x0003F868 0x0004086C 0x000BB934 0x000B63A4 0x000B48B8
Proceeding back via exception chain:
   Exception state (sv=0x59992000)
      PC=0x000B7EDC; MSR=0x00009000; DAR=0x61A96000; DSISR=0x42000000; LR=0x00035620; R1=0x61D9FD60; XCP=0x00000024 (0x900 - Decrementer)
      Backtrace:
0x0003560C 0x00035EB4 0x00036B7C 0x000B1DD4
   Exception state (sv=0x103ea00)
      PC=0x00000000; MSR=0x0000D030; DAR=0x00000000; DSISR=0x00000000; LR=0x00000000; R1=0x00000000; XCP=0x00000000 (Unknown)
BSD process name corresponding to current thread: kernel_task
Mac OS version:
Not yet set
Kernel version:
Darwin Kernel Version 9.8.0: Wed Jul 15 16:57:01 PDT 2009; root:xnu-1228.15.4~1/RELEASE_PPC
System model name: PowerMac7,3
System uptime in nanoseconds: 23328410180
unloaded kexts:
(none)
loaded kexts:
com.apple.driver.AppleHIDKeyboard     1.0.9b4 - last loaded 766564865
com.apple.iokit.IOUSBHIDDriver     3.4.6
com.apple.driver.AppleUSBMergeNub     3.5.2
com.apple.driver.PioneerSuperDrive     2.0.9
com.apple.iokit.SCSITaskUserClient     2.1.1
com.apple.driver.XsanFilter     2.7.91
com.apple.iokit.IOATABlockStorage     2.0.6
com.apple.driver.AppleUSBHub     3.4.9
com.apple.iokit.IOUSBUserClient     3.5.2
com.apple.driver.ApplePMU     2.5.6d2
com.apple.iokit.IOATAPIProtocolTransport     1.5.3
com.apple.driver.AppleK2SATA     1.0.4f2
com.apple.driver.AppleGPIO     1.3.0d0
com.apple.driver.AppleVIA     1.5.1d1
com.apple.driver.MacIOGPIO     1.3.0d0
com.apple.driver.AppleCPUThermo     2.0.0a0
com.apple.driver.AppleMPIC     1.5.3
com.apple.driver.AppleI2C     4.0.0d2
com.apple.driver.AppleK2SATARoot     1.0.5b1
com.apple.iokit.AppleGMACEthernet     1.5.9f1
com.apple.driver.AppleFWOHCI     3.9.7
com.apple.driver.AppleKauaiATA     1.2.1f4
com.apple.driver.AppleUSBEHCI     3.4.6
com.apple.driver.AirPortBrcm43xx     365.91.19
com.apple.driver.AppleUSBOHCI     3.4.6
com.apple.driver.AppleK2     1.7.2f1
com.apple.driver.AppleSPU     2.5.6d2
com.apple.driver.AppleMacRiscPCI     3.4.0
com.apple.driver.AppleCore99NVRAM     1.1.1
com.apple.driver.AppleFlashNVRAM     1.0.5
com.apple.security.seatbelt     107.12
com.apple.nke.applicationfirewall     1.8.77
com.apple.security.TMSafetyNet     3
com.apple.BootCache     30.4
com.apple.driver.DiskImages     199
com.apple.driver.AppleMacRISC4PE     2.0.4d9
com.apple.driver.AppleUSBComposite     3.2.0
com.apple.iokit.IOSCSIMultimediaCommandsDevice     2.1.1
com.apple.iokit.IOSCSIBlockCommandsDevice     2.1.1
com.apple.iokit.IOBDStorageFamily     1.5
com.apple.iokit.IODVDStorageFamily     1.5
com.apple.iokit.IOCDStorageFamily     1.5
com.apple.iokit.IOSCSIArchitectureModelFamily     2.1.1
com.apple.iokit.IOFireWireFamily     3.4.9
com.apple.iokit.IOATAFamily     2.0.1
com.apple.iokit.IO80211Family     216.1
com.apple.iokit.IONetworkingFamily     1.6.1
com.apple.iokit.IOUSBFamily     3.5.2
com.apple.iokit.IOKeyLargo     1.7.2f1
com.apple.iokit.IOHIDFamily     1.5.7
com.apple.iokit.IOStorageFamily     1.5.6
com.apple.driver.IOPlatformFunction     1.8.7d5
com.apple.iokit.IOPCIFamily     2.6
I downloaded istat pro and installed it. Temperature is fine (51 top in both processors) rpm is right in all the fans BUT the drive bay rpm fan is constant: 1000 rpm without any variation
After 15 minutes, it freezes. No response. I only plugged the monitor and the keyboard and mouse (with cords. I stopped using the magic mouse since the problem appeared and the computer does not have Bluetooth included, I use an USB dongle that now is unplugged)
That's all the news for now

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