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Message: <blockquote data-quote="wings5j" data-source="post: 38652" data-attributes="member: 1341">Well, I made it home and had a little bit of time to investigate.  Per the parts book, it looks like my s/n (11381) would have the bronze filter, but after raising the cab, it appears that I have the newer style port block and no bronze filter.I stopped by the dealer and talked with one of the technicians.  He said there are three sensors in series, a differential pressure sensor at the main filter mount; a pre-charge sensor at the hydrostat; and a temp sensor at the port block.  From the way I described its operation, he didn't think I had any pre-charge pressure problem.I changed out the main filter to eliminate it from the equation.  The technician also said that one of the sensors could be bad so I will at least need to check these out and hopefully by process of elimination will get it sorted out.We are just getting into the snow season, so I would sure hate to have anything serious go bad.The service manual does not seem to have any troubleshooting section related to the warning light so I guess I will have to try and follow out the wiring diagram and go from there.  Any other advice from you guys would be appreciated.John</blockquote>