As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN CRUISE WHEN POWER COMES UP RT PACK PRESSURE 45. LT PACK PRESSURE 25 WITH POWER BACK TO ENROUTE POWER (89.0 N1) RT PACK 41, LT PACK 36 GROUNDED ACFT. REPLACED NR 1 ENG PRSOV. LEAK AND OPS CHECKED GOOD VOLTAGE AND GROUND CHECK GOOD IAW MM 36-11-04 AND 36-11-11.