What was found
WHILE STARTING ENGINE DURING TAXI "FIRST OFFICER PITOT" APPEAR ON EICAS. AC RETURED TO GATE AND AC WAS GROUNDED BY MAINTENANCE ,PERF FIM 30-31 FT 803, REMOVED AND REPLACED K646 R PROBE HT NZ RELAY PER BSWPM 20-81-22, AND WDM 30-31-21. PROBE HT OPS CK GOOD OUT PANEL P61 PER AMM 30-31-00. PERF RH ENG GROUND IDLE PER AMM 71-00-00 EICAS MSG RETURNED AND LT. RE-PERFORMED FO'S PITOT PROBE TEST WHILE RECORDING TEMP, PROBE HT TEST FAILS PER AMM 30-31-00. REMOVED AND REPLACED FO'S PITOT PROBE PER AMM 34-11-01. PERF HIGH RANGE LEAK CK. LEAK CHECK GOOD. PERF RH ENG GROUND IDLE TEST PER AMM 71-00-00, OPS CK GOOD. AC RETURNED TO SERVICE