As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB, DUCT PRESS SPLIT : L10 PSI R40 PSI. NORMAL DURING CRZ DUCT PRESS L42 PSI R 42PSI. NORMAL DURING DESC DUCT PRESS L21PSI R21 PSI GROUNDED YES. IAW FIM TASKS 36-10-00-810-807& 36-10-00-810-810. REPLACED PCV SENSOR IAW AMM 36-12-03-000-801 & 36-12-03-400-801. REPLACED BAR IAW 36-11-03-000-801 & 36-11-05-400-801. PERFORMED ENGINE RUNS AT HIGHER AND LOWER SETTINGS DUCT PRESSURE REMAIN NORMAL AT ALL POWER SETTINGS.