These plugs do go bad had this happen to me on my 97 towlite
Replace it best to be safe
As I remember I had to add a little bit of Romex wire and install a larger J box to make the install easier
I've looked all over the inside and outside and can't find another gfci outlet at all. There are regular outlets in the locations mentioned above.
There is no power getting to the gfci outlet. All breakers are closed. Dont know how or where to reverse track down the wire to outlet. Need a wiring diagram.