What was found
CREW REPORTED A FISHY ODOR IN CABIN AND RETURNED TO FIELD. PLEASE COMPLETE AN SDR REPORT PRIOR TO RELEASING AIRCRAFT. HIGH POWER ENGINE RUNS HAVE BEEN ACCOMPLISHED. UNLOCKING LOG PAGE ACCOMPLISHED ENGINE HIGH POWER RUN, APU BLEED CHECK CABIN CHECK IAW AMM 05-51-26-800-801 PAR 2E, NO ODOR NOTED. ACCOMPLISHED INITIAL INSPECTION IAW AMM 05-51-58, NO DEFECTS NOTED. WILL ENTER ESDR AFTER HEPA FILTERS REPLACED.