What was found
WHILE AT GATE WAITING FOR MTC ON A/C BLACK/GRAY SMOKE POURED OUT OF P18-1 PANEL. FLT CREW SHUT DOWN A/C POWER. FOUND BALLAST FOR FWD LAV MIRROR TO BE SOURCE OF SMOKE. REPLACED BALLAST.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
WHILE AT GATE WAITING FOR MTC ON A/C BLACK/GRAY SMOKE POURED OUT OF P18-1 PANEL. FLT CREW SHUT DOWN A/C POWER. FOUND BALLAST FOR FWD LAV MIRROR TO BE SOURCE OF SMOKE. REPLACED BALLAST.