MC 352 Autoformers

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I have just noticed a problem with my MC352
It’s a couple of years old and sparingly used.
It seems that the transformer on the right (while facing amp) and the heat sink is running cold.

There is no change to the above if I have the output mode switch set to mono or stereo.

Both the channels are working but the balance for the left & right speaker does not work, meaning both channels work
while having the balance is switched to one side only.

I use the MC352 to drive the B&W Matrix 802 S3 (bi-wired)
Marantz-CD17 & TEAC VRDS10 both used as transport
Audionote 3.1x signature DAC
Supratek Chardonnay tube amp

I m quite concerned if any major damage has happened. I’m hoping there is a protection system in place to
cause no major damage. Please give me your feed back and best way to solve this problem.

Thanks.
 
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