As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHEN EXTENDING SLATS WITH SYS NR 3 ONLY, THE SLATS ON THE LT WING EXTEND MUCH SLOWER CAUSING A ROLL TO THE RIGHT. R & R LT OTBD SLAT ACTUATOR NR 3 HYD IAW AMM 27-82-02-4. PERFORMED OPERATIONS & LEAK CHECK IAW 27-82-02-4. R & R LT INBD & OTBD SLAT BALANCE RELIEF VLV IAW MM 27-82-12-4. LEAK & OPERATIONS CHECKED GOOD IAW MM 27-82-12-4. INSTALLED CLAMP TO SECURE RELIEF ACTUATOR IAW MM 27-82-12-4.