Mitsubishi TV model CS35MX1 weird audio problem

I got this set in for a picture problem. I bypassed the PIP and
restored the pix but before doing this I noticed that the right
channel audio was out. I initially concentrated on the PIP and after
bypassing it and testing the set I noticed a humming sound from the
right channel. The humming slowly increases in amplitude and after
awhile it would occur in about one second bursts. The duty cycle, (for
want of a better term) of these bursts eventually speeds up and after
perhaps 30 more seconds short bursts of sound are then heard, (hum,
sound, hum, sound, etc), until the sound stays on permanently.
I found three caps in the audio circuit with somewhat high ESR and
replaced them. Two were 100uf 10V and the third was a 22uf 50V. This
however didn't seem to make much difference. There are two RCA outputs
on the back of the set and they are both good. Has anyone seen this
problem on one of these sets before? Thanks for any assistance. Lenny
Stein, Barlen Electronics.

.

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