My mono wiper works fine but will not return fully to the home position , whist in operation it does go fully down but never returns fully when it ends, I checked the grease in the arm HUB and it seems fine though i havent removed the assembly/motor etc . When it initially happened it nearly stopped , i sprayed the arm joints with lubrication and as i say it works fine in operation, Any advice /info would be greatly appreciated, thanks, Brian.