A Kalitta Boeing 767-300, registration N764CK performing flight K4-1917 from Seattle,WA (USA) to Vancouver,BC (Canada) with 2 crew, was on approach to Vancouver, when the crew selected the flaps to 30 degrees however received a trailing edge flaps disagree warning message. The crew initiated a go around, worked the related checklists and landed safely on second approach.
The Canadian TSB reported maintenance observed an issue with the right hand wheel well flap drive unit when the flaps transitioned between 20 and 30 degrees. The drive unit was serviced.