What was found
DURING TAXI OUT, APU MAINT LIGHT ILLUMINATED, RETURNED TO GATE. INSTALLED MISSING HARDWARE AND REPLACED BENT WASHERS. REINSTALLED ACTUATOR ARMS IAW AMM 49-15-31-4. OPS CHECK APU NO MANT MSG NOTICE ON OVERHEAD. CURRENT STATUS SHOWED NO FLIGHT DECK LIGHT WITH MSG 49-1518. (K)