As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 1985 - BUF-CLT - UNCOMMANDED ROLL - AT FL 370 AUTO PILOT NR 1 KICKED OFF WITH AIRCRAFT ROLL LEFT AT 5 DEG. MANUALLY CONTROLLED A/C. ENG PARAMETERS NORMAL, YAW DAMPER NORMAL, RUDDER FREE AND CENTERED. TRIED BOTH AUTO PILOTS TO NO AVAIL. HAD CW/PITCH STEERING. AUTO PILOTS RESTORED AT 4000FT. SPEED BRAKE DID NOT APPEAR AS AUTHORITATIVE. MAINTENANCE ACTION PENDING.