@Craftech posted:the anode (the threaded portion) is supposed to be grounded on the mounting plate (which it is)
Yes, anode to case.
@Craftech posted:The resistor wire looks OK and measures around 2.3 Ohms or so.
I'm not sure what the spec is for the resistor, but that should be close. Is it still in the circuit properly(shunted around the diode)?