I found a couple fried dogbones in parallel. Enough paint remained for me to identify them as 47K which matches one version of the schematic. Together they should measure 23.5K but I got about 5K.
Underneath them was an even crispier resistor which I can't make out. Again, the schematics for this circuit vary widely, but I'm fairly certain it should be 33K - not 7K.
I wonder hat caused the failures ? I'll replace them and keep my fingers crossed.
