Buying Advice Please

[RMD]

Hi, I am looking at an A1 TFSI C o D S Line 1.4 auto petrol for my daughter. It has done 72,000 on a 66 plate with a full service history & 1 owner. I am factoring in a cam belt change in the negotiation with the dealer as there is no evidence of it being done etc. I have been reading conflicting advice re servicing the gear box, Audi say there is no service interval as it is 'sealed for life', also an Audi independent said the same, however, I believe that it should have an oil & filter change. Any advice would be appreciated & an idea of cost would be great. Cheers