As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER T/O W/FLAPS AT 20 DEGREES AT 400 FT AGL FLAP HANDLE PLACED IN UP POS THE FLAP ASYM + GONG CAME ON AND THE SLATS DID NOT RETRACT. INSTALLED A REPAIRED FLAP TRANSMITTER (LT) IAW MM CHAPTER 27-509. COMPLETED OPERATIONAL CHECK IAW MM CHAPTER 27-502. NO DEFECTS, SYSTEM CHECKS SATISFACTORY.