On Sunday, July 14, 2019 at 5:14:41 AM UTC-4, wrote:
I have a dead GFCI outlet. Called electrician. Assessment lose connection or broken wire somewhere between breaker box and GFCI outlet. Since this outlet is in kitchen and wires are running behind tile wall I dont want to damage the tiling. What should be the step by step process to find where the fault is in path from Breaker to GFCI?

Must not be much of an electrician. Didn't he do the process to find
the bad connection? You have the overhead of the visit, once there
most times they should be able to find it pretty easily, unless something
unusual is going on, like illegal splices that are inaccessible inside a wall.
Plus the electrician should have a sniffer device to help trace the circuit..

Do you know which breaker it's on? If so, start by finding out what else
is on that breaker. Find out if everything else works or not. Closest
thing that still works, I'd take a look inside there for loose connections.
It's basically tracing the route of the circuit from the breaker to the GFCI
to find where it's disconnected.

Is it just that GFCI, nothing after it that also does not work? What is the
purpose of the GFCI, where is it? That may help figure out what circuit it's
on if you don't know it.