As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR TURNBACK DUE TO FLAP ASSEMETRY INDICATION. LT T/E FLAP INDICATOR STAYED AT 15 DEGREES AND THE RT WENT TO 5 DEGREES. DETERMINED THAT THE FLAP SPLIT WAS INDICATION ONLY. R & R LEFT FLAP NR 1 POSITION TRANSMITTER IAW AMM 27-517-45. OPS CHECKED GOOD.