Front end shop will increase the pressure to this level when aligning the front end; gives a more accurate reading on the test drive by eliminating tire tracking, etc. Most places would then return to normal pressure when returning to the customer (most customers don't check the pressure on a routine basis when the vehicle is just returned so it is good that you did.) Therefore your front-end place had a lack of attention to detail. Ask them about it and tell them to get it right; they obviously need the feedback.
