Just bought this truck a month ago. I get the reduced engine power message with the wrench. But the trucks power isnt reduced. I can still drive it with no issue. If I restart the truck, the message will not come back for a few days. Scanner says p00B7. Some people tell me its the thermostat and some say my dpf is clogged. Not sure what to believe. Looking for a second opinion before I go ahead and replace the thermostats myself. Truck is a job 2 08 with 100k miles on it, bone stock.