What was found
IN CLIMB LVL OFF AT 330, .74M AP-A ENGDG HEARD AND FELT MUFFLED BANG ASSOC W/ROLLING A/P DISENGAGED BANKED SEVERAL TIMES BEFORE STABILIZED BANK NEARED 30 DEGREES. NO OBSERVED ABNML ENG OR SYS INDICATIONS AFTER STABILIZING ACFT, NO OTHER ABNORMALTIES OCCURED DID NOT FEEL LIKE WAKE TURB. NR 1 VOR ILS XCVR CAUSES A A/P TO DISCONNECT. SWAPPED BOXES, PROBLEM DISAPPEARS. SWAPPED BACK REPLACED NR 1 VOR XCVR VOR ILS TESTS NORM PER M/M. PERFORMED YAW DAMP TEST NTF. PERF FLT CONT CK NTF. PERF BORESCOPE BOTH ENG''S NTF.