Dont want to sound like a cu-t, but
Like hell they know anything about RST's. 3 x 5 day weeks x 2 hour = 30 hours , and they havne't checked the pump, and by sounds of it air leaks either. Ask how they know it hasnt got anyleaks?
Hope you dont get charged lots, but there time is still money, and all chargeable as they are a firm.