They aren't that bad to do yourself I done mine I got a genuine seal kit for about 30 quid and the sockets to dismantle the pump for around 20It was a refurbished FIP a couple of years back (I think 2018), but it won't hurt to check, I'll pop out with a torch later and have a proper butchers around. Be a pain if a seal has gone, currently my only mode of transport... so knowing my luck, that is exactly what will be the source of my leak.