Crumar Musical Instruments User Group.

Ok.. wee update, I found my first faulty component, an op amp "UA741TC".
There are 6 of these on the P536 board (which I'm therefore assuming is the VCA?). I scoped the signals going in/out of them and one was dud (I swapped them about to double check). 
This op amp seems obsolete now, but I can get a UA741CN which seems to have similar spec, although I cant find out if it is a direct replacement - If anyone knows for sure I'd appreciate a confirmation.
Hopefully there is no harm in giving it a go anyhow... fingers crossed.