Do you have any source for spare part no longer being produced for FP 4? I can't find any information about it and they are still available on their webpage to buy.
What was it that didn't work on arrival ? Didn't it power on? Are you within EU? If so, why didn't you contact your countrys consumer advocacy agency, instead of waiting 3 months. We have 2 years consumer law within all of EU they would have taken your claim to the company for you.
Was the problem eventually resolved?