As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDX FLIGHT NR 2359: A/F SELECT WOULD NOT ILLUMINATE ON ED. ILLUMINATED ON PUSH ON/OFF SWITCH. AIRCRAFT RETURNED TO GATE. MAINTENANCE SELECTED A/F 3 TIMES. TEST PASSED. GROUND RAN BOTH ENGINES. TESTED A/F AND FOUND NO DEFECTS. MESSAGE ON ED DISPLAYED. NO DEFECTS NOTED. NO PARTS REPLACED. AIRCRAFT RETURNED TO SERVICE.