What was found
THE CREW ADVISED THE ENGINE WAS SURGING WITH PRI AND SEC CONTROL IN FLIGHT (EEC, P SVA OR FCU/EEC /EEC P SVA/EEC) FLT CREW LOST CONTROL OF THE ENGINE ON DESCENT. THEY GOT EICAS MGS (L ENG STATOR AND ENG CONTROL). THEY DID DECLARE AN EMERGENCY. REMOVED AND REPLACED NR 1 ENG EEC PER M/M. BORESCOPED NR 1 ENGINE FOR IN FLIGHT COMPRESSOR STALL PER FIM. REPLACED LT ENGINE FUEL CONTROL PER M/M. GOT SVA F/B INT ON EPCS DURING ENGINE RUN. FOUND D4868 DAMAGE. REPLACED SAME PER BSWPM. REPLACED NR 1 ENG SVA PER AMM/FIM TEST 14 AND EEC TEST NR 7. RAN NR 1 ENG AT ALL PWR.