Thanks, Ron.No, when they fail you replace the whole assembly. Make sure the Line and Neutral feeding the outlet are working correctly. Meaning if this outlet is on a fuse or breaker make sure that power is being supplied to the GFCI before replacing the GFCI. Anyway, when they failk they fail and you replace the unit with a known good new unit. Here in the US the common flavors are either 15 Amp or 20 Amp service. What you have should be labeled and I suggest replace with the same rating.
Ron
I feel so so so so very bad that I had to play around with the Test/Rest buttons. But before we replace the entire thing, are we sure that we found the problem? Are we sure it's not wiring issues? (I didn't fiddle with wires, mind you, aside from maybe elongating it a bit, as I took out the GFCI from its hole and looked at all sides).