What was found
AIR TURNBACK, PILOT REPORTED DUCT PRESSURE GAUGE HAD A 20% SPLIT WITH #2 INDICATING LOWER PRESSURE. R&R PRECODER CONTROL VALVE PER AMM.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
AIR TURNBACK, PILOT REPORTED DUCT PRESSURE GAUGE HAD A 20% SPLIT WITH #2 INDICATING LOWER PRESSURE. R&R PRECODER CONTROL VALVE PER AMM.