New member to forum, was really happy to see such a complete write up on W123 SLS. While the SLS is functionally similar in W124, are the leveling valves (and repair) the same? My '87 300TD SLS jacked the rear end up as for a heavy load, even though there was no load, after only 432K miles. I read your (Biodiesel300TD) troubleshooting guide, but didn't find a "rear end jacked up and rides like shocks are bad" write up. D you have a guess as to what my problem might be? Do you have a kit for W124 valve (if that's the problem)? Do you offer rebuild service? Thanks for your help, David E