Bootcamp partition won't boot with two OSX installations

Hey,
I have a MacBook Pro running OSX Mavericks (10.9.5) and had installed Windows 8.1 through Bootcamp and everything worked like a charm. I then added a new partition to install the developer preview of OSX Yosemite. Everything worked, I could boot to OSX 10.9.5, OSX 10.10, both recovery partitions and Windows.
Lately, my Mac had some issues that made me booting to 10.9.5 recovery and using disk utility to repair the Mavericks and Yosemite partitions (both were good, interestingly I could not repair the disk permissions, though) and I even clicked on "Repair", as the whole disk was selected and Disk Utility repaired something (I forgot what it was, but I think it changed the MBR).
Now the Windows partition is gone, when I option-Boot and when I try to reboot from OSX to the Windows partition using the "startup disk" option of System Settings, it says
No bootable device --- insert boot disk and press any key
I want to be able to boot Windows again (and my OSX partitions) and would love to be able to do so, even when I choose to delete the Yosemite partition once it's out of beta so that I can update Mavericks. I tried using this guide:
Repairing Boot Camp after creating new partition
My problem is that it says that the Windows partition should be number 5 on /dev/disk0. In my case, the described partition is number 6.
Can I simply replace the number and it should still work or will it break something that the Windows partition is not at the place it normally is?
Thanks in advance

Well, I just tried it and it didn't work. I still don't see the Bootcamp partition when I option-boot and when I try starting Windows via Startup Disk settings, the screen just turns black after a while and then a white blinking horizontal cursor appears (not even the "No bootable device" error any longer).
Any help would be appreciated.

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<table border="0" align="center" width="90%" cellpadding="3" cellspacing="1"><tr><td class="SmallText"><b>haroldkarl wrote on Sun, 22 January 2006 12:03</b></td></tr><tr><td class="quote">
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</td></tr></table>
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Bootcamp partition won't boot with two OSX installations

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