Sorry to hear about the low/no power out.
I would start with checking L5 and the BS170's.
After that try checking the LPF stage C47,48, 49, 50, 52 and L6 and 7 to see if anything has cold solder joints. Also check L5, 6 and 7 for continuity.
I am in the middle of build a HT20 (5th one) and once I get it done I can check voltages for you if not solved by then.