As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ETOPS SIGNIFICANT SYSTEM - SLUGGISH FLIGHT CONTROLS AFTER TAKEOFF. NO FLIGHT SPOILERS IN FLIGHT. LIMITED SPEED BRAKES AVAILABLE. GENERAL AIRCRAFT FLIGHT CONTROL NOT NORMAL. DUE TO POOR WEATHER AT KATL - AIR RETURN WAS PERFORMED TO KBOS. NO EMERGENCY WAS DECLARED.