tire monitoring system

[smh3]

question to the experts here. took my h3 into the dealer because the check engine light came on. The said there was a loose cable by the fuse box. the kicker is they said they also reprogrammed the system?. my tire monitoring system know always show low tires, they are at 35 lbs actually too high. I had the system adjusted months ago and it worked fine. I think is was adjusted to 27lbs before it came on. now they say they cant go below 29lbs. i know the tires or even higher that 29. what have they done to mess it up and why cant they return it to the way it was before i took it in or am i being feed a line of crap.