What was found
AIRCRAFT WAS NOT GROUNDED: AUTO BRAKE DISARM LIGHT STAYS ILLUMINATED. CHECKED FAULT HISTORY AND FOUND AACU PREVIOUSLY REPLACED. PERFORMED AACU BITE REF FIM 32-42-00-810-801 AND FOUND "PWR A/B" FAILURE. CONTINUED T/S REF. FIM 32-42-00-810-826 AND FOUND 26VDC AT D1040B PINS A11 AND C9. NEEDS FURTHER T/S REF. FIM 32-42-00-810-826 STEP F.(2) (THRUST LEVER SWITCH / FIM 32-42 TASK 813) ITEM REMAINS ON MEL. REPLACED LEFT (AALA202506179821) AND RIGHT (AALA202506189698) (ATSP)-AUTO THROTTLE SWITCHPACK, PER AMM 76-11-07. OPERATIONAL CHECKS ARE NORMAL.