crwdns2934241:0crwdne2934241:0 Reece

crwdns2934249:0crwdne2934249:0:

Open, remove and clean the logic board for liquid damage. Likely there will be corrosion on the bottom of the board.

Intermittent issues (as you described in the comments of @pccheese answer, is usually caused by liquid. This has probably affected some of the soldered components as well.

Check the I/O cable and trackpad cable (both ends) for liquid too, for good measure :)

crwdns2915684:0crwdne2915684:0:

open