How much would you ask to discount the asking price on a otherwise clean low mileage 4th gen if the 4wd lo will not engage? I have an offer of a $2K drop on an under 100k mile SR5. Ebay actuators look to go for around $500. Has anyone gone that route? Any other possible hidden hazards that I should be looking for with the beeping 4lo? Is $2K too little or it enough to deal with the possibility of a major repair.