A/C tune-up: "Condenser fan motor drawing high amperage"
If a motor is drawing a very high amperage it is not unreasonable to advise a repair.  If the motor cannot be cleaned, or it has been cleaned and still drawing high it may show an imminent failure.  So you could replace the motor while they are at the home, usually with no additional labor, or maybe have an emergency call in the future where you will now be charged labor in addition to the motor.  It is worth checking around with other customers of theirs to see if they are trustworthy or not.  Hard to tell off one diagnosis.