As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON CLIMBOUT DUCT PRESSURE DIFFERENTIAL 22 PSI (R50PSI LT28PSI) CRUISE DIFFERENTAIL PRESSURE (10PSI RT40PSI LT 30PSI) A/C PRESSURISED NORMALLY. ACFT GROUNDED. ACCOMPLISHED LT ENGINE BLEED AIR SYSTEM HEALTH CHECK PER MM 36-11-00. FOUND BLEED AIR REGUALATOR AND HIGH STAGE VALVE BAD. REPLACED BLEED AIR REGUALATOR PER MM 36-11-03. REPLACED HIGH STAGE VALVE PER MM 36-11-06. BOTH OPS AND LEAK CHECKED GOOD.