[lederhos]

I agree with Scott's assessment that your tire pressure issue was more likely related to the valve stem leaking (assuming you had not already had them replaced) and less so on your 15" Marathons. I too have an '08 3124 KB and ended up replacing the stems the second season. One tire went low tipping me off. I checked both tires by gently applying pressure lateraly on the valve stem and both leaked significantly. Have checked them each season in the same way after having the stems replaced and no leaks. All ties have maintained pressure since then.