Question 1. When a DECU box is replaced it is most unlikely that the witness lines on the receptacles of the new box will line up with those on the aircraft connectors. Do we clean everything off and start again with "initial application"?
Logically a new DECU box* would be unmarked so one would only need to tighten the connector and place a witness mark where the connectors mark is...
*One is assuming you don't replace an old DECU box with another "used" one...