As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLAP RETRACTION, FLAPS REMAINED AT 1 DEGREE WHEN SELECTED UP. DURING EXTENSION WITH ALTERNATE FLAPS, FLAPS BEGAN TO SHOW ASSYMETRY AT 5 DEGREES. ACFT GROUNDED. AIR TURNBACK, ACCOMPLISHED FSEU BITE PROCEEDURES IAW FIM 27-51 TASK 801. FOUND FAULT 27-53416 FOR SKEW SENSOR NR 8 FAILED. REMOVED AND REPLACED THE SKEW SENSOR IAW AMM 27-59-01. OPS CHECKED THE FLAP SYS AND PERFORMED AMM 27-59-00. TEST PASSED AND OPS NORMAL. FAULT CLEARED FROM FSEU.