What was found
LOST ALL NAV'S ADF, VOR & LOC, DME, GLIDESLOPE CAPTAIN SIDE, DUE TO POWER SURGE AT INU RACK. SMELL OF ELEC BURN NOTICED. R & R NR 1 NAV UNIT STRAP BOARD IAW AMM 34-32-11. OPERATIONS CHECKED GOOD. SEE NRWC 680-DFW-01857 ACFT REMAINS COMPLIANT FOR CONTINUED CAT II OPERATION.