I have a WG K7203 chasis that has no 6V to run the heater and the 24V is coming up at only about 15V, however my B+ is 121. Does anyone have any ideas for me?
Also Try desoldering the vertical ic U401 and see if your voltage comes up.
The 24v line goes to the vertical ic TDA1675A. and If the Hv comes up then
replace the ic.