As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE 1:30 HOURS AFTER T/O FUEL CROSSFEED VALVE LIGHT REMAINED ILLUMINATED WHEN VALVE SELECTED OPEN. EICAS MESSAGE FUEL CROSSFEED DISPLAYED. AIRCRAFT RETURNED TO MAD. PERFORMED PROCEDURE IAW FIM 28-22-00/101 FIG 108 BLOCKS 1, 2 AND 14. REPLACED FUEL CROSSFEED VALVE, PERFORMED TEST WITH SATISFACTORY RESULTS. AIRCRAFT WAS RETURNED TO SERVICE.