DX7 power supply fire?

Hi! Glad to have found this forum!

I am a DX7 owner from when it was brand new in the mid-80s, and recently I saw a post elsewhere that said there was a common problem which some DX7’s have that causes the synth somehow not to turn off with the power switch, or turn on/off randomly, and in some extreme cases, causing fire.

I can’t find any detail on this, and am wondering if anyone else has heard of this? It was presented as a capacitor failure in the post, but I can’t imagine how a cap failure would cause the power switch not to be functional.

Does anyone know any detail or history on this? I’d love to replace whatever might fail before it does, and save myself from a potential fire!!

Thanks in advance!