Cannot reduce incline - Nordic Track NordicTrack A2350 Pro Treadmill

It is likely that the relay responsible for the incline down function is the one located at the lower right corner of the board. You may also want to check the power supply as well as the wiring of the solenoid coils connected to the board to ensure that they are working properly. Additionally, you should also check the motor controller board itself and make sure all of the connections are secure.

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engine temp is higher than normal, temp will increase when engine is under load usually climbing an incline, it may take a considerable distance of level driving to reduce temp

It sounds like you have a membrane issue. There are a number of different T9450 models and they all have slightly different consoles. You'll need your serial number to help pinpoint the parts you need. Your best bet is to go through the manufacturer (johnsonfit.com) and have them help you get the correct membrane and overlay.

Merit 725T. The treadmill has gone into a "10 degree" incline mode on its own, and will not respond to the control panel

These codes are related to the throttle body and the throttle position sensor. Check to make sure there is no binding at the throttle body. The problem could also be the stepper motor that drives the throttle plate.

It was reduced engine power. I'd bet you have some "TAC" codes, Unless you are very mechnicaly inclined then you need to end up at a shop. They have been rewiring the tac modual and replacing the trottle bodies to fix this problem.

Check here for the user manual:
http://manualfox.com/link/reebok.htm

And maybe send them a manual request?

Try replacing the knock sinser

Check the catalytic converter. If it is clogged, it will reduce your your power and increase the temp of the car, especially on steep inclines.