From recall page at HD:
Last updated Oct 23, 2018
The hydraulic clutch system with secondary clutch actuator part numbers 37200131and 37200131A on the subject motorcycles may exhibit an internal leak of fluid past the secondary clutch actuator piston/seal. If this leak continues for an extended period, the clutch master cylinder reservoir could lose enough fluid toexpose the hydraulic clutch circuit to air, which may result in the inability togenerate enough lift to disengage the clutch.
Model 2017 Ultra Limited CVO
Safety risk
If this condition remains undetected, it could lead to a loss of control of the vehicle when started in gear, first shifted into gear, or coming to a stop.
Remedy
Owners of affected motorcycles will be asked to arrange service with an authorized Harley-Davidson dealer, who will confirm that the motorcycle is covered by this recall. If covered, the dealer will install a new secondary actuator piston assembly from the recall kit, P/N 91500093. This service will beprovided at no charge to the customer.
We strongly urge you to take your motorcycle to your dealer to have the appropriate service performed as soon as possible. Should you choose to ride your motorcycle prior to this service, we urge you to be aware of this condition. Some product campaigns may have expired and you may have to pay for the service. Please see your local Harley-Davidson dealer for further details