As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING A SCHEDULED INTENTIONAL DEPRESSURIZATION OF THE AIRCRAFT IN FLIGHT TO VERIFY THE OXYGEN MASK DROP SYSTEM, THE AIRCRAFT RETURNED WITH THE FOLLOWING SNAG: DURING MASK DROP TEST - IN CLIMB - THE CABIN ALTITUDE INDICATOR FROZE AT 3,000 FT - AFTER MASKS DROPPED THE INDICATOR WAS TOPPED AND THE NEEDLE JUMPED TO THE 13,000 FT RANGE.