As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CREW SWAP IN CLT, ARRIVING CREW FOUND A FISH ODOR IN COCKPIT AREA. MAINTENANCE CHECKED OVERHEAD PANELS IN COCKPIT. SLIGHT ODOR WAS NOTICED COMING FROM MASTER CAUTION PANEL. REMOVED AND REPLACED CAUTION PANEL AND OPS CHECKED GOOD PER AMM 33-12-01. SMELL DISSIPATED AFTERWARDS AND AIRCRAFT WAS RELEASED FOR SERVICE.