Looking for help diagnosing problem with powered speaker

[olddawg]

They're stuffed inside an unventilated speaker cabinet, on a board bolted to a toasty heatsink. And probably snuggled into a big wad of acoustic wadding too. So probably not far off it.

And are usually covered with prodigious amounts of silicone glue to keep them from vibrating loose. Over the years I have seen dozens if not hundreds of domed ( even exploded)caps in just about every kind of audio and video equipment. The old rule of overating by 20% no longer applies. It's disposable technology and planned obsolescence. Powered monitors seem to be especially prone to it. Not just M-Audio either.