What was found
RELEASED PER MEL 21-32B L HAND PACK PRIMARY TEMP CONTROL INOPERABLE. GROUNDED-YES. LEFT PZTC BITE SHOWED PREVIOUS FLIGHT FAULT FOR "THIS PACK TCV". ACCOMPLISHED T/S, PER B737-800 FIM 21-62 TASK 830-INITIAL EVALUATION (VERIFY TEST) DID NOT CONFIRM FAULT-TEST PASSED WITHOUT REQUIRING FIM RESET PROCEDURE. DUE TO HISTORY, PERFORMED CABIN TEMPERATURE CONTROL AND INDICATION OPERATIONAL TEST, PER B737-800 AMM 21-61-00-700-807-002 WHILE ALSO MONITORING PACK TEMPS-LEFT AND RIGHT PACK TEMP CONTROL VALVES OPERATED NORMALLY AND PZTC BITE SHOWS NO FAULTS. CLEARS MEL 21-32B.