As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MASTER CAUTION LIGHT FAILED TO ILLUMINATE WITH BOTH CENTER FUEL PUMP LOW PRESSURE LIGHTS ILLUMINATED AND CENTER FUEL QTY AT ZERO. ACFT ENGINES WERE USING FUEL FROM WING TANKS SO CENTER TANK SHOULD HAVE BEEN EMPTY. ACFT GROUNDED. COULD NOT DUPLICATE. ACCOMPLISHED CENTER TANK BOOST PUMP AUTO SHUTOFF FUNCTIONAL TEST REF MM 28-22-00-720-805, TESTED NORMAL.