"This was the first time this GFCI has tripped. "

If it continues to work it was a nuisance trip. they are quite sensitive. A little spray of water into anything runniong off it can trip it. In fact certain funny loading appliances can make it trip due to certain harmonics on the power line, depending on how they are designed, even if they are not plugged into it sometimes.

I though you meant it kept on tripping.