As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PIT - FLT 9550 - AIRCRAFT WAS ON A TEST HOP AFTER A MAINTENANCE CHECK, WHEN JUST AFTER TAKEOFF, A SMALL AMOUNT OF SMOKE WAS NOTED IN THE COCKPIT. FLIGHT RETURNED TO FIELD AT PIT WITHIN MINUTES OF TAKEOFF. FLIGHT LANDED WITHOUT FURTHER INCIDENT. NO EMERGENCY WAS DECLARED. MAINTENANCE FOUND THE ACM OVERSERVICED. RESERVICED ACM. OPS CHECK GOOD. NO SMOKE OR ODOR NOTED. (M)