What was found
AIR TEMP DUCT SUPPLY INDICATOR GIVES ERRONEOUS INDICATIONS: L PACK = 0 PASS CABIN = 17 SUPPLY CABIN CONT = 22 R PACK = 0 SUPPLY DUCT AFT = 0 PASS AFT CABIN = 18 SUPPLY DUCT FWD = 10 CABIN TEMP IS NORMAL. T/S INDICATED BAD/INTERMITTENT GROUND W2218 5505 20 OR W2218 5504 20. FLEXING BUNDLE CAUSED TEMP INDICATION TO VARY FROM CORRECT INDICATION OF 20 C TO APPROX 10 C. FOUND GROUND TO PANEL BAD. UPPER LEFT CORNER OF PANEL. RESEATED SCREW TO PANEL. OPS TEST GOOD REF AMM 21 61 00 700 807 002.