As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: CAPTAIN REPORTED FLAPS DID COME DOWN TO 15 DEGREE VERY VERY SLOWLY WITH TE DISAGREE LIGHT FLAPS RETRACTED BACK TO ZERO NORMALLY BUT THEN LOCKED AT 1 DEGREE WHEN CALLED FOR 15 DEGREEREMOVED AND REPLACED FLAP/SLAT SHUT OFF VALVE MODULE IAW AMM 27-51-48.