Also why replace a bit of it, it all the same age. Electronic stuff has a design life of 10 years how old is it all? And the usual question how old is your phone laptop etc
Imo it's the cream that go to uni. If everyone goes it's just another a level.
However I was intrigued on the t level. Didn't know if it and seems a good idea
if there is 12v across the Bell trig and hold off pos and 12v across hold off pod and beg it should be sounding.
there shouldn't be 12v across ho pos and Bell trig normally
you dont need the resistoer looking at your image as you have trigger monitoring enabled