As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT CRUISE 350 CABIN ALT HORN SOUNDED. CABIN PRESSURE VERIFIED TO BE BETWEEN 10,000 - 11,000 FT, 2 PSI DIFFERENTIAL. RAN CHECK. LIST NO AUTOFAIL LIGHT. MOVED SWITCH TO STBY AND SET CRUISE ALT OF 7000 FT IN WINDOW. CABIN STARTED DOWN AT 700 FPM. BEGAN DESCENT INTO ARC AND SLOWLY REGAINED THE CABIN ALT. REMOVED & REPLACED CABIN PRESS CONT REF AMM 21 31 21, OPS CHECK GOOD REF AMM 21 31 00 702 001.