What was found
DURING CLIMB OUT,PASSING ABOUT FL280,RECEIVED RT CABIN DOOR WARNING LIGHT,AFTER PUSHING DOOR HANDLE THE DOOR WARNING LIGHT WENT OUT,BUT THE CABIN PRESSURE CONTINUED TO CLIMB TO 10,000,RESULTING IN A CABIN PRESS WARNING. PERFORMED BITE TEST OF NR 2 CABIN PRESSURE CONTROLLER, BITE WAS GOOD. SUSPECT THE FORWARD OUTFLOW VALVE. REMOVED AND REPLACED FWD OUTFLOW VALVE REF M/M 21-31-12-4.