marked141 wrote:
I think your correct except maybe on C, it could be but it would be one that I look at for awhile before setting it aside to come back to and then, finding it later, may drop it down into a lower grade or setting it aside again or posting pictures ¯\_(ツ)_/¯
That being said, I don't think it is but out of an abundance of caution for mercury, check that silver square box for an indication of what it is.
Yeah its not mercury but I was going to pop that off too. Trying to figure out what the little round red thing is on the card's not a battery I don't think some kind of switch or relay