We cleaned this vent in September of 2022.  It had been long overdue for a cleaning, but when we did clean it, we also recommended they upgrade their accordion transition vent to a DryerFlex.  These allow maximum air velocity through the dryer duct which decreases lint buildup in the vent.  We came back in November of this year to check the vent and see how it is doing.  There was some lint around the damper in the gooseneck, which is a good sign since that is the first place we can see it collecting.  We removed that and then recommended that they give us another call in 2 years.