What was found
DURING TAXI NR 2 ENGINE N1 AND N2 BEGAN UNCOMMANDED ROLLBACK, EGT CONTINUED TO CLIMB. ABOUT 840 DEGREES NR 2 GENERATOR CUT OFF. PLACING NR 2 START LEVER TO CUTOFF HALTED EGT RISE. ACFT GROUNDED. PERFORMED EIS BIT TEST, NO DEFECTS NOTED. VERIFIED FROM CREW MAX EGT 835 DEGREES NR 2 ENGINE PRIOR TO SHUTDOWN. IAW AMM 31-42-00. PERFORMED ENGINE FUEL FEED VALVE CHECK FOR NR 2 ENGINE, VALVE LEVER MOVED NORMAL, INSPECTED NR 2 ENGINE FOR FOD ON INTAKE AND EXHAUST, NO DEFECT NOTED. CONFIRMED ENGINE ROLLBACK AT ENGINE RUN. FOUND VSV FEEDBACK CABLE BROKEN AT VSV ATTACH ROD END. R & R VSV FEEDBACK CABLE REF AMM 75-31-02. ADJUSTED VSV FEEDBACK CABLE, REF AMM 75-31-02, PERFORMED ACCEL/DECEL CHECK REF AMM 71-00-00, TEST NR 8. OPS CHECKS GOOD.