This very much looks like the 8k version of the 2001N dynamic board shown in the first attachment. If so it will have eight 4108 type dynamic RAM chips soldered in the first RAM bank. The second bank is clearly empty and has been subjected to Commodore’s unpleasant practice of drilling holes to prevent upgrading. The second attachment should be the correct circuit diagram I think.
In terms of early stage fault finding it’s good practice to verify that the regulators are generating the correct voltages using the meter. However, the PET’s behaviour is suggestive of a poor connection and reseating the socketed 6502 CPU would be a useful early step.
Alan