As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DESCENDING FROM FLIGHT LEVEL 260 CABIN ALTITUDE LIGHT ILLUMINATED ON THE MAP. LOST CONTROL OF CABIN ALTITUDE IN BOTH AUTO AND MANUAL MODES. MASKS DROPPED. PRESSURIZED AIRCRAFT ON GROUND IN MANUAL MODE. COULD NOT PRESSURIZE IN AUTO MODE. REMOVED AND REPLACED ELECTRONIC CONTROLLER IAW MM 21-30-01. OPS CHECKS GOOD. PN ON: 22201T011400 SNON: 493 SNOFF: 530