As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
OVERHEAD "MAINT" CAUTION LIGHT ILLUMINATED UPON LANDING. GROUNDED - YES. FFR LOGGED 36-12021. #2 FAMV NOT IN COMMANDED POSITION. VALVE WAS IN FAILED OPEN POSITION. ACCOMPLISHED ENGINE ON PNEUMATIC SYSTEM TEST. OP CK NORMAL. FAULT RESET. REF B737-9 AMM 36-00-00-730-801.