As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: PILOT REPORTS ACT FAILED TO TRANSFER IN FLIGHT. AT GATE ARRIVAL IN DFW FWD ACT QTY 5220 LBS, AFT ACT QTY 2280 LBS. MAINTENANCE INSTALLED ACT TRANSFER VALVE ACTUATOR ( 6QH) IAW AMM 28-28-53. OPS CHECK NORMAL IAW AMM 28-28-00.