As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ETOPS SIGNIFICANT SYS - AFTER START UP, LT PACK WOULD NOT OPERATE WITH NORMAL PNEU PRESS. RECYCLED SWITCH TO NO AVAIL, CLOSE APU VALVE AND REOPENED AND PACK OPERATED NORMALLY. GROUND RUN CHECK OK AFTER ENG START PNEU PRESS AND OPS OF LT PACK CHECK OK WITHOUT HAVING TO CYCLE BLEED SW'S. CAN NOT DUPLICATE WRITE-UP, OK FOR SVC.