FIRST TIME TRANSMISSION SMALL RED LEAK ON FLOOR,

What is your question?

OWNED CAR SINCE NEW, FIRST TIME TRANS. RED FLUID ON FLOOR. WENT TO NEW GARAGE, AND THEY WANT TO REMOVE TRANSMISSION, CHANGE PART IN FRONT AND MAY REPLACE BRUSHING. HOW DO I KNOW THEY WILL NOT SPOIL THE CAR. IT WORKS GREAT. NO LIGHTS ON DASHBOARD. ANY ADVISE. ANITA