What was found
RIGHT PACK OVERTEMP AND FAILED INFLIGHT. LEFT WAS MEL ED,DESCENDED BELOW 10000 ON OXYGEN. EMERGENCY DECLARED. AMM21-51-00-5, FIM21-51 TREE 803, 805. PERFORMED OPS TEST OF RH PACK AND CONTROL SYSTEM, AND BITE CHECKS OF CONTROLLERS. NO FAILURES OR MALFUNCTIONS ON RT PACK AND NORMAL CONTROLLER. FOUND RT STBY CONTROLLER FAILURE ON CHANNEL 4, IN CONSULT WITH MOC CONSIDERED PACK NR 2 SERVICEABLE. AMM21-51-11-2, REPLACED RIGHT LOW LIMIT CONTROL VALVE IAW AMM 21-51-11-2. PERFORMED BITE TEST TO CONTROLLER AND NO FAULTS LIGHTS ILLUMINATED. ACFT OK FOR SERVICE. ORIG SUB DATE; 8/31/2022