What was found
ON CLIMBOUT LT PACK LITE ILLUMINATED, FOLLOWED QRH PACK LITE EXTINGUISHED WITH MASTER CAUTION RESET. TEMP CONTROL INOPERABLE. GROUNDED-YES. PERFORMED B737-800 FIM 21-53 TASK 820, THROUGH STEP F(3)(B), FAN BYPASS CHECK VALVE DOOR IS SATISFACTORY. PERFORMED PACK TEMPERATURE CONTROL BITE PROCEDURE, REF FIM 21-62 TASK 801, NR 1 RADA FAULT ON BIT AND PREV FLIGHT TESTS. NR 1 RADA VERIFY TEST PASS. NO HARD FAULTS NOTED, PER TECH SERVICE REQUEST AS PRECAUTION. REMOVED AND REPLACED NR 1 RADA, REF B737-800 AMM 21-51-21, OPERATIONS CHECK GOOD. VERIFIED PACK TEMPERATURE CONTROL BITE PROCEDURE FIM 21-62 TASK 801, NO FAULTS.