DS1515+ durability & 100 Ohm resistor

Looking at a second hand DS+ plus series, (will be my first synology).

Found a DS1515+ on ebay in the UK and looks in good shape.

Seller says the cmos battery has been replaced, but I do read reports that the DS1515+ has a 100Ohm resistor issue that often needed fixing on the mobo.

Seller says that this was a late 2017 model so didn't suffer the same issue as the earlier manufactured DS1515+ series.

Before I plough forward, any guidance or 2nd hand purchase guidance on DS1515+ series?