As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: ON ARRIVAL TO LAX FLIGHT CREW REPORTED THAT THE CABIN ALTITUDE FLUCTUATED BETWEEN 3750-3800 V/S-50 TO +300 22K CABIN ALTITUDE 6500-800' AT 10K CABIN ALTITUDE WENT TO -15. AN EMERGENCY WAS DECLARED, THE AIRCRAFT LANDED AT LAX WITHOUT FURTHER INCIDENT AND TAXIED TO THE GATE ON ITS OWN POWER. MAINTENANCE REPLACED CABIN PRESSURE CONTROLLER #1 (11HL) AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK PER AMM 21-31-00.