Very old post but relevant to me now. AGP with double protected pump circuit; GFCI at pump and in the breaker box in garage. GFCI tripped yesterday for apparently now reason. Hasn’t rained in days. Messed with resetting both breakers but still trips. I ran an extension cord from another outdoor gfci receptacle to the pump and it trips that too. Stands to reason I have something going on in the pump then, right? I’ll take the cover off the pump tonight and see what I see. Any words of wisdom would be appreciated.