What was found
AIR TEMP CONT CAB IN "FWD" POSITION INDICATES 100+ AT CRUISE. FLIGHT ATTENDANT REPORTS HOT AIR IN CABIN ROWS 6-10. GAUGE FLUCTUATES AT TIMES WHEN IN FWD AND CONT CAB POSITION. GROUNDED - YES. INITIAL EVALUATION SHOWED ALL GAUGE READINGS NORMAL. SUSPECT INTERMITTENT FAULT. CLEANED FLIGHT DECK AND CABIN SENSOR FILTERS. PERFORMED FIM TASK 21-61 TASK 858 AND 21-61 TASK 859. SYSTEM OPERATED NORMALLY. TEMP IN CABIN AND FLIGHT DECK REFLECTED WHAT WAS ON GAUGE.