As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT: 9199, AFTER TAKEOFF PINK FLUID LEAKAGE AND ODOR FOUND ON FIRST OFFICERS FLOORBOARD. RETURNED TO DEPARTURE AND LANDED WITHOUT INCIDENT. FOUND RESIDUAL HYDRAULIC FLUID DUE TO BRAKE RESERVOIR OVERSERVICE. CLEANED RESIDUAL HYDRAULIC FLUID. INSPECTED FIRST OFFICERS BRAKE MASTER CYLINDER AND BRAKE LINES NO LEAKS NOTED.