As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON T/O CLIMBING THRU 4000FT IN TURN FLAPS 1 GEAR UP. WE HEARD A LOUD THUMP FOLLOWED BY A YAW TURN TO THE LT F/A REPORTED UNUSUAL NOISE ON THE LT ENG. PILOTS DID NOT SEE ANY UNUSAL ENGINE OR PRESSURE INDICATIONS. RETURNED TO LAS. PAXS IN ROW 25/26 SAW A FIRE BALL AND THEN SMOKE ON NR 1 ENG. DAMAGE FOUND STAGE 3 HPC BLD35. MEASURED TO .055 DIM B. R&R NR 1 ENGINE PER TC 78471000 AND 78471001 WO # 10109.