As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAKEOFF ON FLIGHT 2898 CREW REPORTED RIGHT AFTER GEAR RETRACTION, ELEC BURNING SMELL STARTED, GOT MORE INTENSE DURING CLIMB OUT. STRONGER ODOR IN COCKPIT & FRONT OF CABIN. THE ACFT WAS REMOVED FROM SERVICE. FOUND CAPTAIN'S FLASHLIGHT BATTERY HAD STRONG BURNING ODOR. R & R CAPTAIN'S FLASHLIGHT ASSEMBLY IAW AMM 33-50-16, OPERATIONS CHECKED GOOD.