T15 working perfectly for a couple months... and then nothin

[codependency]

Hey outside world...
So I have 2 wonderful t15 installed in a beautiful chassis...
Made some fat recordings, including running it thru a UA175b (wow)
Then during setup before a session... No audio.
I tore everything apart, never believing it could be the pre.
But to my disappointment, it was. I re-soldered all the joints and did my basic troubleshooting.
There is absolutely no clicks and pops while plugging in... the board shows 18v where it should. I am guessing one of the output amps took a crap, but I wanted to make sure. I am guessing these op amps are not too hard to find (i hope).
Just wanted to find a good way to test these amps so I dont have to replace them all.

Thanks so much...

[tpryan]

So one module failed and the other is OK?

[codependency]

Oh yeah... failed to mention, one works perfectly still, and the other one failed. Sorry.

[tpryan]

As always, the first thing is to verify the supply voltages are correct at the op-amp pins.

If you have a scope or signal tracer, apply a test signal to both modules. Set controls the same on both. Test for signal at the output of each IC until the signal disappears. Let us know what you find.