As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RT DUCT PRESSURE INDICATES APPROX 8 PSI ON GRD W/ THRUST AT IDLE AND AT FL 290. ENG A/I OFF. WITH POWER CHGES R DUCT IS SLOW TO RESPOND LAGS LEFT DUCT BUT EVENTUALLY MATCHES THE LT DUCT. AT HIGH POWER SETTINGS RT BLEED OPERATES NORMAL. PRESSURIZATION AT ALL PHASES OF FLIGHT WAS NORMAL. GROUNDED - YES. REMOVED AND REPLACED #2 ENGINE HIGH STAGE VALVE IAW AMM 36-11-06. FOUND HIGH STAGE REGULATOR CONTROL PRESSURE TEST BAD IAW AMM 36-11-00. REMOVED AND REPLACED HIGH STAGE REGULATOR IAW AMM 36-11-07.