What was found
WHEN SELECTING ACFT PWR (APU) ON THE GND, THE PWR SHIFT REJECTED THE APU PWR, THE APU FAULTED AND SHUTDOWN. QRH PROCEDURE FOLLOWED AND APU RESTARTED SUCCESSFULLY AND THE AC ACCEPTED THE APU PWR. AFTER TAKEOFF THEN BEGAN TO EXPERIENCE NUMEROUS ELECTRICAL ANOMALIES. AS FOLLOWS: UNCOMMANDED DISCONNECT OF AUTOTHROTTLES, RECONNECTED OK; RADAR FAILS AND RESTARTS INTERMITTENTLY; CAPT AND FO FLOOD AND PANEL LIGHTS INTERMITTENT, CTR AUTOPILOT EXCESSIVE PULSING (USED RT A/P); NO AUTOLAND ON ASA, BOTH DME L AND R FAIL EVENTUALLY LOST FMC NR 1. DURING ARRIVAL L GEN FAILED. AFTER A FEW MINUTES MOST ELECTRICAL ANOMLIES DISAPPEARED. EMERGENCY WAS DECLARED AND NML CAT I ILS FLOWN TO A SAFE LANDING.