Interpreting Apple Hardware Test Codes...How?

Is there a chart or document that will allow me to decode the errors that are produced by the Apple Hardware Test software?
I'll provide the two errors I've seen, but they don't happen all the time. I'd like to know what these mean, but I'd really like to know how I can decode these and future errors myself.
4MHD/2/40000002:0x7ee50490
I'm assuming this one is a hard drive error, but which one? Internal? External USB Drive? How do I tell?
4YDC/2/40000002:0x7eea4890
I'm not sure what this one is.

First of all, thanks for all your and everyone else's help on this!
I had some corruption on my internal hard drive which I was finally able to fix using a combination of tools (Diskwarrior and Speedtools) and a reformat and reload of the OS. I was still having problems, but they did not appear to be disk related. I started wondering if there might be some hardware issues causing the issues that may have led to the disk corruption previously and be causing some more current issues. I had installed Mac OS on an external drive and had been booting from that to run some of the various tools and I was still having problems. Anyway, as I've been unplugging one device at a time and doing testing, it seems that my system has become much more stable since I have left the one external drive with Mac OS on it unplugged.
At this point, I'm guessing my problem is either a failing but intermittent internal hard drive (since it had corruption to begin with), or something about the external drive that my system doesn't like (that made the system unstable even after cleaning up the internal drive). Recent problems could be either or a combination of both.
Anyway, I think this narrows it down pretty good, so I'm just leaving the suspect external unplugged and waiting to see if I have more disk related problems.
Thanks again.

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    com.apple.driver.AppleHDA     2.3.0f2
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    com.apple.driver.AppleSMCPDRC     1.0.0
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    com.apple.driver.AppleSMCLMU     2.0.2d0
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    com.apple.driver.AppleIntelHDGraphicsFB     8.0.0
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    com.apple.driver.XsanFilter     404
    com.apple.iokit.IOAHCIBlockStorage     2.2.0
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    com.apple.driver.AppleFWOHCI     4.9.5
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    com.apple.iokit.AppleBCM5701Ethernet     3.2.5b3
    com.apple.driver.AppleAHCIPort     2.4.0
    com.apple.driver.AppleUSBEHCI     5.1.5
    com.apple.driver.AppleEFINVRAM     1.6.1
    com.apple.driver.AppleSmartBatteryManager     161.0.0
    com.apple.driver.AppleRTC     1.5
    com.apple.driver.AppleACPIButtons     1.6
    com.apple.driver.AppleHPET     1.7
    com.apple.driver.AppleSMBIOS     1.9
    com.apple.driver.AppleACPIEC     1.6
    com.apple.driver.AppleAPIC     1.6
    com.apple.driver.AppleIntelCPUPowerManagementClient     196.0.0
    com.apple.nke.applicationfirewall     4.0.39
    com.apple.security.quarantine     2
    com.apple.driver.AppleIntelCPUPowerManagement     196.0.0
    com.apple.kext.triggers     1.0
    com.apple.iokit.IOSerialFamily     10.0.6
    com.apple.driver.DspFuncLib     2.3.0f2
    com.apple.iokit.IOAudioFamily     1.8.9fc9
    com.apple.kext.OSvKernDSPLib     1.6
    com.apple.iokit.IOFireWireIP     2.2.5
    com.apple.driver.IOPlatformPluginLegacy     1.0.0
    com.apple.driver.IOPlatformPluginFamily     5.2.0d16
    com.apple.driver.AppleHDAController     2.3.0f2
    com.apple.iokit.IOHDAFamily     2.3.0f2
    com.apple.driver.AppleSMBusPCI     1.0.10d0
    com.apple.iokit.AppleBluetoothHCIControllerUSBTransport     4.0.9f8
    com.apple.driver.AppleBacklightExpert     1.0.4
    com.apple.driver.AppleSMBusController     1.0.10d0
    com.apple.iokit.IOSurface     86.0.2
    com.apple.iokit.IOBluetoothFamily     4.0.9f8
    com.apple.driver.AppleGraphicsControl     3.2.6
    com.apple.nvidia.nv50hal     8.0.0
    com.apple.NVDAResman     8.0.0
    com.apple.iokit.IONDRVSupport     2.3.4
    com.apple.iokit.IOGraphicsFamily     2.3.4
    com.apple.driver.AppleSMC     3.1.3d11
    com.apple.iokit.IOSCSIBlockCommandsDevice     3.5.1
    com.apple.iokit.IOUSBMassStorageClass     3.5.0
    com.apple.iokit.IOSCSIArchitectureModelFamily     3.5.1
    com.apple.driver.AppleUSBMultitouch     235.7
    com.apple.iokit.IOUSBHIDDriver     5.0.0
    com.apple.driver.AppleUSBMergeNub     5.1.5
    com.apple.driver.AppleUSBComposite     5.0.0
    com.apple.iokit.IOFireWireFamily     4.5.5
    com.apple.iokit.IOUSBUserClient     5.0.0
    com.apple.iokit.IO80211Family     500.15
    com.apple.iokit.IOEthernetAVBController     1.0.2b1
    com.apple.iokit.IONetworkingFamily     3.0
    com.apple.iokit.IOAHCIFamily     2.2.0
    com.apple.iokit.IOUSBFamily     5.1.6
    com.apple.driver.AppleEFIRuntime     1.6.1
    com.apple.iokit.IOHIDFamily     1.8.0
    com.apple.iokit.IOSMBusFamily     1.1
    com.apple.security.sandbox     220
    com.apple.kext.AppleMatch     1.0.0d1
    com.apple.security.TMSafetyNet     7
    com.apple.driver.DiskImages     344
    com.apple.iokit.IOStorageFamily     1.8
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