What was found
DIVERSION/DECLARED EMERGENCY, DURING CRUISE DESCENT 40,000 TO 38,000FT. NR 2 ENGINE SURGED 5 TO 6 TIMES. CROSSFEED WAS OPEN & FWD & AFT NR 2 MAIN TANK PUMPS OFF. FUEL IMBALANCE 4300LBS (L) 4000LBS. DURING SURGES NR 1 N1 71% NR 2 N1 56% AND VARYING 51% TO 56% WHEN BOOST PUMPS TURNED ON -SURGING STOPPED. R&R HYDRO MECHANICAL UNIT PER MT.