What was found
CABIN ALTITUDE DECREASIN G AT FL 210 POSSIBLE LEAK SEE L/P 8233584, 8236201, 8231369 AND 8236285 FOR FINDINGS, INSPECTIONS AND OPERATIONAL CHECKS. UPDATE REF CORRECT L/P IS 8231369.R PACK TEMP MSG DISPLAYED. INOPERATIVE LIGHT WILL NOT RESET. ITEM HAS HISTORY - PACK TEMP CONTROLLER PREVIOUSLY REPLACED. DEF RT PACK TEMP IAW 2151AJ CW MAINT PROCEDURE TOMC APPROVES MEL 2151AJ FOR RH PACK TEMP CONTROL. PERFORMED BITE ON RH PACK TEMP CONTROLLER REFERENCING AMM 21-51-00-745-159 AND FOUND CONTROLLER FAULT LIGHT ILLUMINATED. CONTROLLER, REMOVED AND REPLACED RIGHT PACK TEMPERATURE CONTROLLER IAW REF AMM TASK 21-51-14. OPS TEST GOOD.