What was found
FA S REPORT CABIN TEMP IMBALANCE VERY COLD IN BACK. ROW 6 12 ARE GOOD (OR SLIGHTLY WARM) FORWARD OF ROW 6 IS COOL GROUNDED YES. CLEANED CABIN SENSORS FOR REF AMM 21 61 06 100 801. CABIN TEMP IS NOW EVENLY MAINTAINED. SEAMC NOTIFIED. ETOPS SIGNIFICANT SYS. NON ETOP MECHANIC. AC IS TOP DEFERRED. ACCOMPLISHED GENERAL VISUAL INSPECTION(GVI) OF CABIN TEMP SENSORS. NO IRREGULARITIES NOTED. SYS CHECKS NORMAL. GROUND VERIFICATION SUCCESSFUL. THIS CLEARS TOP DEFERRAL. ACFT RETURNED TO ETOPS STATUS. SEAMC MARK NOTIFIED.