Progress!
I suspected Agnus since that was the most crusty looking. I took it out for the fourth time and cleaned the pins and socket again, and made extra effort to get it aligned before pushing it down.
And with JP15 not jumpered, it booted to the Kickstart 1.3 screen. I was able to use an external drive to load Amiga Test Kit and memory and CIA tests all seems good.
However, it still boots to white screen with JP15 jumpered, so there must be something wrong with the CDROM drive.
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