As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
R1 DOOR AFT EXIT SIGN FOUND MALFUNCTION, REF TO NON-ROUTINE NR 9419567. SPEC NR B787-33-3-0002. REPLACED R1 DOOR AFT EXIT IDENTIFIER SIGN. PERFORMED CONDITION CHECK & INSTALLATION TEST FOUND NORMAL, AS PER AMM 33-51-03-00A-520 A/720A REV 142.