As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ETOPS SIGNIFICANT SYSTEM, RIGHT ENGINE EGT FLUCTUATED ERRATICALLY DURING DESCENT WITH POWER LEVER RETARDED BELOW CRUISER POWER BETWEEN 600 DEGREES AND 55 DEGREES. PERFORMED FIM 77-21-00 FIG 103. NO DAMAGE OR FAULTS FOUND. OPERATED ENGINES. NO FLUCTUATIONS OF EGT NOTED, LT AND RT ENGINES EGT REMAINED SIMILAR AT ALL POWER SETTINGS. NOTIFIED MOC OF WORK ACCOMPLISHED AND FINDINGS.