According to llamma.com, the e74 error is to do with the AV Cable or possibly the GPU. I dunno if the kit will help in this sense. Hopefully trying another cable might help or at least be the 1st course of action.
To quote them "E74: AV cable error... There is a problem with the AV cable, try using a different AV cable. If the cable is known to be working then there is a 90% chance it's a scaler chip problem (the "ANA" or "HANA" chip connected directly to the AV cable) in rare cases it is the GPU."
source: http://www.llamma.com/xbox360/repair...rror-codes.htm
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