Please don't all kill me here but, I replaced 3 lights tested those 3 and all working. Went to do a 4th a restored power and now the rcd trips. Put everything back to how it was and no power to any outgoing circuits but all circuits have 240v. No tripping at all unless I put in a plug top tester and the rcd goes Split board 2 rcds, this is a job for a friend who won't be friends with me much longer. I assumed if I remove lighting circuit (l, n, e) that I worked on that would restore power to all other circuits but the problem remained Any ideas?