Are you having the car serviced at a Lexus dealership, if so the car is under warranty for 100K miles or 10 years
Ask them to look at there re call list, its quite a common on the LC, quote the Lexus Forum, most of the time the dealerships have no clue of re calls
The US have a recall for this which is what i tell my dealership, but then the US get a lot more re calls than Europe get, we only seem to get the ones that involve life and death
Its not a easy or cheep job to replace it, it took them the best part of the day to do mine
Every now and then open the flap and wiggle it back and forth a few times, i normally do it when i clean the car, also a square of WD40 should help