My Accuphase P-500 Power Amp just blew - Tracing the issue

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My Accuphase P-500 Power Amp blew yesterday. Smelt something has burnt. Replaced the fuse but doesn’t power on. Checked all the circuit boards and didn’t see any blown/fried parts other than the fuse that was replaced.

The circuit protection components in the pictures looked fine.

Any help / advise would be much appreciated.

Best

Ed