As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU PNEUMATIC PRESSURE WENT TO ZERO AFTER PUSHBACK AIRCRAFT BACK TO BLOCK AND GROUNDED BY MAINTENANCE, CYCLED APU. REGAINED DUCT PRESSURE AFTER RESTART. OPERATED BOTH PACKS. W/ PRESSURE BUILDING. IAW AMM 49-52-00. AIRCRAFT RELEASED FOR FLIGHT.