if you have a handyman tester use it to check the #2 rec and use a vom and check the snubbers on the spider block first.
The 2 rec's are notorious for causing issues like this, they will go out before the #1 does usually, this is why it is listed for the possible cause first before the 1rec.

When you use the handyman there is a test mode for hi voltage bleed thru , do that test and if you see the light light or even blip then replace the scr.

just make sure you double check all the connections before replacing any.