Found out a cleaning place is happy with my work

Found out a cleaning place is happy with my work. My boss and service manager were told this lately. They do house cleaning having two Mercedes Benz Sprinter vans in their fleet, started to go where I work at for repairs. New customers and one of their Sprinters had an oil leak come back from another shop supposably fixed. Talked to the service manager and told him I needed to drop the engine out to find the leaks. He called them, told him to do it telling me this. The previous shop bent one tube up installing it creating the leak and missed a tube that was leaking. I did right and found they had no more oil leaks on Monday. The owner of that place brought me a sugar free German Chocolate cake she made finding out I am pre diabetic which she is too.