Stevew1

Deff  do it yourself   You don’t need  the Oem Lexus  part  just get the part number  and search on line you will get the  same cylinder as the oem one  for less than £100 it’s a simple matter to change parts over ie the reservoir.

Sand with 600 grit emery paper With soapy water and then finish with polishing compound with a polisher they will come up like new

Only thing I would add to this is its sometime just a dead motor if reverse tilt not used for a long time brushes in motor corrode slightly as said oil shaft spin with finger and pull shaft in and out connect motor to Battery and run it for a couple of minutes in each direction just reverse wires once you have done this reassemble problem solved