We bought a Gravely IM52 with a 23hp kawi, it now has aprox. 400hrs on it. This year it developed a high pitched squeal whenever I shut the pto off for the blades at higher rpms. The noise was still there at lower rpm's but not as bad. The dealer said that was a normal noise Any other Gravely owners have this problem? Its coming out of the 2 year warranty period and I dont want to get stuck with a big bill next year. Thanks in advance.