What was found
AIRCRAFT WAS GROUNDED: MULTIPLE FAILURES INCLUDING AUTOPILOT INOPERATIVE, AUTOTHRUST INOPERATIVE, AUTO FLIGHT RUDDER TRIM 1 FAULT, YAW DAMPER 1 INOPERATIVE. CAPTAINS ALTIMETER UNRELIABLE. NO LIGHTS IN CABIN UNTIL GEAR CAME DOWN. UPPER AND LOWER ECAM DISPLAYS ON AND OFF MULTIPLE TIMES. RETURNED TO DFW. EMERGENCY DECLARED. FOUND #1 GEN PHASE (A) DAMAGED AT LOWER DISCONNECT. REPLACED #1 IDG FEEDER HARNESS TO THE LOWER / UPPER PYLON DISCONNECT. SYSTEM OPERATIONAL CHECKS NORMAL. ALL FAULTS CLEARED PER AMM 24-21-43.