I've worked on some Sony Beta decks. Bad cans often don't bulge (A cheap Chinese ESR/RLC/transistor tester is a must for smoking out bad caps in SS gear). If it is 80's sony and there are any surface mount lytics; CHANGE them...Do not pass GO or collect $200. I hear when the surface mounts pee themselves it corrodes the traces off the board...Beware of that.
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