What was found
TAKEOFF 1000 CLIMBING 115 VAC BUS OFF CAUTION LOSE EICAS INDICATIONS ITT, N1, T/O, N2. PPH, FLAPS, GEAR ALL YELLOW DASH RUN QRH. SPS 1/2 INOP WARNING ON CLIMBOUT ALONG WITH ALL MSG STATED ABOVE AIR RETURN TO AZO-C/A-PERFORMED OPC CHECK OF DAU1 REF. AMM 31-41-00 OPSCHECK GOOD.PERFORMED POWER RESET, ALL MSGS CLEARED REF. AMM 24-40-00. PERFORMED STALL PROC. TEST REF. AMM 27-36-00. OPS CHECK GOOD.