Mine was purchased privately too, but they still replaced two dead
FOC last week (and it is more than 4 yrs old. So that is not necessarily prohibitive.
Had it been regularly serviced by Renault for the previous owner/s? Again, even if it hadn't, it is acceptable that it be serviced by a competent outfit, without losing its warranty.
Did you get its history when you bought it? This is important because if any work was done in the year preceding your purchase, it would have been warranted work (for 12 months) so there may be a comeback from there. Apart from that, was there any recurring fault when owned by the previous owner/s?
Did you have to pay for any recurring fault?
Have you read, on this forum, that any of the repairs you had to pay for were known faults on this model?
These are the type of questions/answers that will have a bearing on the final outcome.
I would dearly love to see
make you an offer of some assistance, but it does depend on detailed analysis of what has been going on with this car.
Cheers for now and stay in touch.