Well it looks like you're off the hook, TN, there is no such pin. The PPGA pins are labeled as a matrix (ie A3, B2, etc) and the numbers only go to 37.

On the SEPP (Slot-1) version, A43 and B43 are both data lines. No, not a good idea to disconnect those at all!

-=DrFoo {Sysop} Third Wave BBS (941) 355-7136=-