As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE STRONG ACRID SMELL IN COCKPIT TURNED OFF PILOT FLUORESCENT & SMELL WENT AWAY. FOUND ONE OF THE CAPTAIN`S FLUORESCENT LIGHT BULBS NOT COMPLETELY SEATED IN LIGHT SOCKET. REMOVED AND REPLACED CAPTAIN'S FLUORESCENT LIGHT BULBS IAW B747 MM CHAPT 33-11-11. OPS CHECKED SYSTEM FOR 7 HRS. NO DEFECTS OR ABNORMAL ODORS NOTED. SYSTEM OPS CHECKS GOOD IAW B747 MM CHAPT 33-11-00.