As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON POWER UP FOR TAKEOFF STANDARD POWER SET LOST ALL EQPT ON AC BUSS NR 2 AND ALL F/O INSTRUMENTS. REJECTED TAKEOFF. SWAPPED APU'S GEN CONTROLLER UNIT(GCU) WITH NR 2 GCU, REF 24-22-12-04. RAN NR 2 ENG IAW JRH , NR 2 GEN OPS CHECKS NORMAL. R/I FROM FACT SWAP COMPONENT POSITIONS.