What was found
RETURNED TO FIELD AFTER HEARING LOUD NOISE AND SEEING A FLASH FROM THE RIGHT SIDE OF AIRCRAFT. ENGINES OPERATED NORMALLY UPON RETURN. *S/D* AUTOTHROTTLES ON, NO ABNORMAL INDICATIONS ON ANY ENG INSTRUMENT, NO EICAS MESSAGES. RETURNED TO ORD WITH NO FURTHER PROBLEMS- ENGINES OPERATED NORMALLY DURING RETURN. ACCOMPLISHED FIM 71-05-00 PG104-105. NO DEFECTS ON BORESCOPE, CHIP DETECTORS, OR MESSAGES. REPLACED OIL FILTER MM 79-21-05. NO LEAKS NOTED AFTER ENGINE RUNUP.