What was found
TAT READS 44DEG C (FLUCTUATES BTWN 42 AND 46 DEG C -WHILE PARKED WITH ENG SHUTDOWN - CAPT PITOT OVHEAD LT EXTINGUISHED. ACTUAL OUTSIDE AIR TEMP 03DEG PER CVG ATIS(<P>SWAPPED RELAY K552 NO HELP, REPLACED K644 AND K10446 NO HELP . CHECK GND AT RELAY K644 PIN X2 NO GND FOUND FROM BOTH SPEED CARDS. NEEDS FURTHER TS / TS TO TAT FAULT, FOUND GRND MISSING AT K516; TS TO SENSOR RT GEAR TILT S10598 - (PN 8-527-03 ) . REMOVED AND REPLACED SENSOR S10598 IAW WDM 27-62-11 OPS CHECK OK IAW 30-31-00 OPS CHECK OK </P>)