What was found
IDLE DISAGREE EICAS MESSAGE DURING TAXI IN. REMOVED NR 1 ENGINE PT2 PROBE. INSTALLED NEW PROBE IAW AMM 73-21-03. APPLIED SEALANT AND PERFORMED TEST 14 PT2 SYSTEM LEAK TEST IAW AMM. TEST PASSED. PERFORMED TEST NR 6, STILL HAD SAME MESSAGES. CONTINUED TROUBLESHOOTING, FOUND M590 L EEC DISCRETE CARD P-50 PANEL AT FAULT. REMOVED AND REPLACED M590 L EEC DISCRETE CARD P-50 PANEL. PERFORMED TEST NR 6 NO FAULTS FOUND IAW AMM 71-00-00 AND WDM 73-21-12. PERFORMED NR 2 ENG RUN IAW MM 71-00-00. NO FAULTS FOUND. ACFT OK FOR SERVICE.