As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON CLIMB OUT DUCT PRESS FLUCTUATES BETWEEN 30 AND 40 PSI TIL 10,500' ON APPROACH SHUT R PACK OFF, LEFT DUCT SURGED.(<P>PERFORMED AIR SUPPLY BITE TEST IAW 36-23-00 NO DEFECTS NOTED AT THIS TIME. PER AMM 36-10-00 DUCT PRESS IS REGULATED BETWEEN 30 PSI AND 50 PSI.</P>)