As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAXI OUT PRESSURIZATION AUTO FAIL LIGHT & ALT LIGHT ILLUMINATED, GATE RETURN. TROUBLE SHOT & FOUND CONTROLLER INOPERATIVE. R & R CONTROLLER IAW MM 21-31-01-401. OPERATIONS CHECKED GOOD AT THIS TIME. WIRING CHECKS DONE ON NR 4922229.