As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAXI OUT, WARN ELEX MSG APPEARED AND WAS UNABLE TO RESET. ACFT RETURNED TO THE GATE (BTB) AND MAINTENANCE GROUNDED ACFT , MTX PERFORMED BITE PROCEDURES 31-51 TREE 801 MSG CLEARED A/C OK FOR SERVICE. ACFT RETURUNED A SECOND TIME AND MESSAGE WAS CLEARED, FOUND A MODULE M616 AT FAULT, RESET OPS CHECK NORMAL IAW AMM 34-27-00. AND RETURNED ACFT TO SERVICE.