As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MUSTY SMELL IN COCKPIT UPON ARRIVAL AT A/C UPON ARRIVAL TO AIRCRAFT THE ODOR WAS VERY FAINT AND ALMOST GONE. FOLLOWED FIM TASK 05-50-00-810-831-A. AIRPLANE HAS HISTORY OF HYDRAULIC LEAK AND SUSPECT RESIDUAL HYDRAULIC FLUID GOT INTO APU INLET AND HAD MOMENTARY SMELL. LAST CREW DIDNT REPORT ANYTHING AND NO HISTORY FOR ODORS RELATING THIS ISSUE.