I don't see why it should be a main dealer job. The belt must be done or else you risk this persons bad experience....
"I have a 1.6 petrol 16valve Scenic 2000 (W reg) good car, very adaptable but all went wrong when at 48000 miles, the auxillary belt sheaded, the debris got into the timing belt and ruined the engine. my question to Renault can this happen, their reply was non comittal but said in certain circumstances that this could happen and tough luck!!! Buy a new engine £2500. I have been very careful with this belt ever since but a couple of weeks ago after the Major 72000 mile service the aux belt went again, the renault dealer said the jockey pully caused the break. Bill was £289 for repair, next day after 5 miles the car came to a stop. you`ve guest, the aux belt again but this time it has ruined the engine again. Cause this time, alternator problems. Renault should realy get to grips with this, making engines that can fail when the auxillary belt fails, but they have not and indeed the current cars on sale, all have this potential expensive problem. I understand the problem covers all their current engines 1.4, 1.6 2.0 petrol and 1.9 deisels. On my experience a broken aux belt has a 66.6% probability of writing off the engine. BE WARNED.
In 45 years of motoring with all types of cars including other Reaults I have never had engine trouble because of Auxillary Belts."