What was found
AIRCRAFT HAD ABRUPT UNCOMMANDED ROLL EVENT AT 39000FT .78 MACH AFTER RECOVERY LH TRAILING EDGE FLAPS INDICATED .5 DEGREE DEPLOYED A/C LANDED UNEVENTFULLY WITH FLAPS UP. BRAKE COOLING WAS PERFORMED AND AN EMERGENCY WAS DECLARED <[01]. OK TO CONTINUE PER MX NOTE PER MPM 53.3 FUNCTIONAL CHECK FLIGHT. AUTHORIZATION NUMBER 256322; [02] REMOVED AND REPLACED #2 FLAP SKEW SENSOR PER AMM 27-59-01; OPS CHECK GOOD. SEE WORK ORDER NUMBER 100209278 FOR DETAILS.; [03] ENTERED SELECT REFERENCE 27-59-01-400-802-NG (OUTBOARD FLAP INBOARD SKEW SENSOR INSTALLATION - PERMANENT).