My tractor is 13 years old and has never missed a beat. However recently the air restriction trouble light has been coming on. I replaced the filters. Still on. I replaced the sensor. Still comes on. The tractor runs fine. The light is not always solid and it will flicker. I’m not much of a mechanic, I’m really just a low end parts changer so I’m not good at diagnosing problems. Wondering if anyone else has dealt with this issue. Thanks.