As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON PUSH GOT A/P EICAS & DISCREET LIGHT. TRIED RESETTING AND BOTH REMAINED.AC TRTURNED TO GATE (BTB)AND MTX GROUNDED AC T/S AS PER FIM 22-03-00 NO FAULTS NOTED PERFORMED MCDP GND TEST 30 NO FAULTS PERFORMED TEST 40 TEST NO FAULTS. PERFORMED 22-03 FT 818. 819 A/C DOWNGRADED TO CATI. AC RETURNED TO SERVICE