I've just re-organised my case and I somehow misconnected one module (missed the top 2 pins) in my monster case.  The 2 A-118s were on the same power board as the misconnected module.  The A-140 was not connected onto the bus, but I had put it into the case as part of my re-jig of modules.  

Now, it appears none of them work as designed.

First A-118 module is board rev 1 from 1996 (one of my earliest purchases) with a TL064CN op-amp and a BC549 transistor.  It powers up and one LED of random control lights up - nothing else functions...only output is a from the coloured noise socket - a regular 1ms square wave of approx 1.6-1.8V 

Second A-118 module is board rev v3 2012 with an LF347N op-amp and BC547C transistor . This appears dead - no LED activity, no output

Third - A-140 ADSR  Module is board rev 1 1996 (another early purchase!)   TL084CN op-amp and HFC 4001BE FRAM  , 4x BC549s and 1x BC559 transistors.    Module sees incoming trigger pulse (via LED activity, H/L/M switch appears to work, but no output (checked via oscilloscope).  Any reason this module's output would have ceased to function

I'm OK to DIY repair these if I know which parts could be affected  - I'm assuming the IC's may be fried...  

Appreciate any help/advice

Thanks