As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ISSUE CREW REPORTED- DURING CLIMB AT AROUND 17000, DEPRESSURIZATION OCCURRED SHOWING AMBER CABIN ALT AND CABIN RATE. CREW FELT THE PRESSURE DROP IN THEIR EARS, STARTED DESCENT AND EMERGENCY RETURN. TWO MORE DEPRESSURIZATION EVENTS AT 7000 AND 2000 FT OCCURRED ON APPROACH. CORR ACTION- MX R&R OF ELECTRO-PNEUMATIC OUTFLOW VALVE. PERFORMED FUNCTIONAL TEST OF PNEUMATIC OUTFLOW VALVES. CHECKS GOOD. PERFORMED PRESSURIZATION CONTROL SYSTEM - FUNCTIONAL TEST IN AUTOMATIC MODE. CHECKS GOOD.