What was found
DURING PREFLIGHT, NR 2 ENGINE EGT TEMP, READ OUT HAS A RED BOX AROUND IT. ACFT GROUNDED. PERFORMED FMC CDU FAULTS TASK CARD 78273000 AND FOUND NO CURRENT FAULTS ON NR 2 ENGINE. PERFORMED T49.5 PROBE AND EGT SYSTEM INSPECTION. RESISTANCE CHECKS ALL WITHIN LIMITS, IAW AMM 77-21-01. PERFORMED EGT CLEANING, IAW AMM 77-21-00, T49.5 READINGS BEFORE: S1: 155.32, S2: 50.74, S3: 51.29, S4: 96.55. AFTER: S1: 47.13, S2: 29.35, S3: 29.99, S4: 45.18.