one of the treadles always elevates higher than the other one. treadclimber very noisy, making a clanking noise while in operation. Not as noisy while operating as a treadmill. callled the company I bought it from, and they say they cannot help me at all since there is no service representative close to my home town. How do I fix my $3500 treadclimber that I have had for about 6 years when no one will service it for me.