As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU DOES NOT PUT OUT MORE THAN 3 PSI. WILL NOT OPEN PACK OR STARTER VALVES. NO APU PNEUMATICS SEE HISTORY. APU BLEED VALVE IS CLOSED. REPLACED FLOW SENSE MODULE OPS CHECKED OK. RAN BOTH PACKS, MOTORED BOTH ENGINES, DUCT PRESSURE READS 35 PSI.