Not too long ago Ag land Implement of New Hampton, IA had a used RWA for R62-R72 listed. Not sure if its still there. If I'm guessing correctly I think its a '97 model. Anyway, here is their n 515-394-4226. Good luck,
you might try heberer equip in southern illinois. they are closing their doors and were the biggest gleaner dealer in illinois for many years. they might have one cheep
turn the RWA switch on. If the combine doesn't slow down by 25% it is not working. If it does slow down and you still have good hydro pulling power you should be ok. A RWA motor can be checked out via the case drain volume. There should not be over just a steady stream out the small case drain line when directed into a clean 5 gal bucket instead of returning to the tank when loading the hydro with the brakes.
if they dont have one there they do have on in germantown one on a 62 or 72 that burned last fall and one on a r5 tht just came in last week i saw dairyfarmer