As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
*ATB* AS ADVERTISED APU BLEED VALVE CLOSES ABOVE FL200 WITH APU BLEED SWITCH ON. AIRCRAFT WAS AT FL250. CREW CAUGHT THEIR MISTAKE IN SAFETY TERMINAL AREA. AIR TURN BACK PER A300 AOM 02.01.04.03 SYSTEM OPERATES NORMALLY. PERFORMED PACK FLOW CONTROL AND INDICATING TEST PRECAUTIONARY REF. AMM 21-11-00. CHECKS GOOD.OK FOR CONT. SERVICE.