As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER ROTATION ON TAKEOFF AIRCRAFT WENT INTO ALTERNATE LAW, ELACS 1 & 2 FAILED. NO FAULTS ON OVERHEAD PANEL BUT ELACS 1 & 2 INOP DISPLAYED ON STATUS PAGE. FLIGHT ATTENDANTS IN AFT OF A/C REPORTED THUMPING SOUND IN TAIL.-R&R COMMAND POSITION TRANSDUCER PER AMM 27-44-56-400-001. OPS CHECK GOOD PER AMM 27-41-00-720-001-A AND AMM 27-96-00-710-022-A.