As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER PUSH BACK IN KSCK RIGHT ADI WAS COLLAPSED AND AFTER TOTAL RESET ON DE-ENERGIZING THE PLANE STILL PERSISTED THE PROBLEM AC RETURNED TO THE GATE (BTB) AND MTX GROUNDED A/C MTX DEFERRED R IRU IAW ABX MEL 34-21-1-1-2B MX ACTIONS COMPLIED WITH, PLACARD INSTALLED MBCB 06-22-2026 MUST BE REINSPECTED EACH FLIGHT DAY. A/C DOWNGRADED TO CAT 3A. AND RETURNED A/C TO SERVICE.