I have a new customer who has a frick RWB II 270 with a TDSH 233 screw compressor. According to the log book the compressor has done 70,000hrs with regular oil / oil filter changes. There has been no vibration analysis over the years and the compressor has never been overhauled.What is the average hrs run before bearing replacement and would it be better to send the compressor away for an overhaul / reman replacement rather than overhaul on site.(Recommended reman co in the UK)