As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT BLEED TROUBLE. ACCOMPLISHED HEALTH CHECK OF PRSOV AND REPLACED SOURCE AIR SWIVEL FITTING, SWIVEL LOOSE WHILE B NUT SEIZED. IDLE OPS CHECKED AND FOUND NR 1 BLEED PRESSURE FLUTUATES BETWEEN 12-15 PSI. REPLACED HIGH STAGE PILOT VALVE PER AMM 36-11-08.