What was found
DURING CRUISE FLIGHT AT FL290 ACFT EXPERIENCED A CABIN PRESS LOSS. AN EMER DESCENT WAS ACCOMPLISHED. ALL CABIN MASKS WERE DEPLOYED. LANDING WAS UNEVENTFUL. ACFT HAS BEEN RELEASED FOR AN OPERATIONAL CHECK FLIGHT. REPLACED THE LT MAIN GEAR SAFETY SWITCH, OUTFLOW VLV, SAFETY VLV, PRESSURIZATION DUMP SOLENOID, DUMP & TEST TOGGLE SWITCH, PRESET SOLENOID VLV & PRESS CONTROLLER. A SUCCESSFUL OPERATIONAL CHECK FLIGHT WAS PERFORMED. ACFT WAS RETURNED TO SERVICE.