As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON CLIMB OUT, FLAPS 15 ALL IS WELL. WHEN FLAP HANDLE RAISED FROM FLAPS 15 GOT AN ASSYMETRYCAL WARNING LIGHT. RUN QRH RETURNED TO DEPARTURE. FAULT CONTINUES ON GROUND OPERATION . VERIFIED SLAT ACTUATOR NR 1 DIDN`T RETRACT AT HANDLE AT 2 DEG POS. INSPECTED SLAT ACTUATOR SWITCH CONNECTOR DIRTY. CLEANED UP IAW AMM 27-82-011-4 AND CHECKED OPERATION NORMALLY SEVERAL TIMES ON GROUND.