below the transformer a metal can is visible containing the mains filter. Smoke residue is visible on the brass standoffs of the transformer and the grey metal mount.

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   root42 (root42@chaos.social)'s status on Sunday, 26-May-2024 01:50:43 JST root42

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   So I went to fetch the oscilloscope to start probing. Suddenly -- POOF! Smoke, and the lights in my workspace went out. The mains filter blew -- while the machine was switched off! The mains filters on PETs and CBM Floppy Drives are between live and neutral BEFORE the power switch, so ALWAYS connected!
   I quickly pulled the plug (not needed thanks to my fuse panel) and inspected the damage...