As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED ACFT COULD NOT MAINTAIN CABIN PRESSURE WITH ENGINES NEAR IDLE POWER AND ENGINE BLEED SOURCE AT APPROXIMATELY 42 PERCENT N1. RIGHT PACK PRESSURE WAS 14 PSI. CABIN ALTITUDE RATE CHANGED FROM MINUS 200 TO PLUS 1,800 AND UP. ONCE POWER WAS REAPPLIED ABOVE 50 PERCENT N1, CABIN RATE RETURNED TO DESCENDING. CREW LANDED WITHOUT INCIDENT. MAINTENANCE TROUBLESHOT, R & R NR 2 CABIN PRESSURE CONTROLLER AND PERFORMED CHECKS IAW AMM. ACFT RELEASED FOR SERVICE.