Still under warranty (2y old campervan).; I understand what you are saying, just read that other members had issues after works have been done. If I lived in North Finland they yes, but temperatures in Mid Wales are not that extreme.I would imagine that once the warranty has expired it wouldn't make any difference if you had it done or not. The problem with the door cables snapping handles, locking you out or opening while motoring only seem to occur in very low winter temperatures. However, if a problem has been identified and you can have it corrected for free - I say 'why not'?