As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: THE AIRCRAFT DIVERTED TO DEN DUE TO THE FLIGHT CREW REPORTING THAT FUEL WAS TRAPPED IN BOTH ACT TANKS AFTER PERFORMING THE MEL PROCEDUR E. THE AIRCRAFT LANDED SAFELY AT DEN WITHOUT FURTHER INCIDENT. MAINTENANCE REPORTED THAT THE FUEL LEVEL SENSING CONTROL UNIT FAILED THE FUNCTIONAL TEST AND WAS REPLACED PER AMM 28-46-34. A SATISFACTORY OPERATIONAL CHECK WAS ACCOMPLUISHED WITH NO ISSUES NOTED.