Amiga 4000T low volume

[mechy]

Having an issue with my Amiga 4000T that I'd like to resolve.  I know it sounds odd but I've had this unit for a couple of years and have never used it for audio, so I don't know if it was ever working.  I also want to make sure I'm not doing something stupid.

Audio volume out of the RCA jacks is very low.  With my speakers jacked up to 100% the volume is barely as loud as when I enable the internal speaker.  It doesn't necessarily sound distorted that I notice, just low.

I tried 2 sets of speakers and 2 audio cables so I know that's not the issue.  I tried playing a MOD from Workbench and also booting to a game disk - same problem.

I tried checking power supply voltage at the motherboard connector and am getting -12.16V, 11.97V and 5.14V.

I've found posts indicating low volume could be caused by a bad power supply and also failing caps.  

Is there anything simple I'm missing?  I believe I have a couple of spare AT power supplies I can try.  What else can I try?

Thanks!!!

Its the caps leaking most likely. time to do it all