What was found
AFT CAB ZONE TEMP ILLUMINATES WITH MASTER CAUTION RECALL, EXT WITH RESET. ACFT GROUNDED. ACCOMPLISHED PACK/ZONE TEMP CONT BITE PROCEDURE. FOUND FAULT LIGHT ZONE ON (TRIM VALVE) ON 1 CONT NO FAULTS ON NR 2. CLEARED FAULT. DUE TO HISTORY ACCOMP GVI OF V146 & V145. CHECK OK. INSP. AFT CABIN ZONE TEMP SENSOR FAN (M1446) NOTICED GRINDING NOISE COMING FROM FAN. REPLACE FAN (M1446) WITH NEW ONE. ACCOMP FAN TEST, TEST PASS. RAN PACKS FOR 30MIN VERIFIED NO ZONE TEMP LIGHTS IN FLT DECK. REACCOMPLISHED PACK/ZONE TEMP CONT BITE PROCEDURE NO FAULTS FOUND REF MM 21-61-11-400-801 & FIM 21-61, TASK 863 & 21-62 TASK 801.