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I need some troubleshooting tips for the SLS on my 1989 e24. In a nutshell, its not working .. the pump isn't cycling, the ride is harsh although there is a little bit of rear suspension travel. Can anyone offer some troubleshooting tips? Before i invest in conventional replacement, i'd like to at least try to get it working. For example ... is there a way to manually trigger the pump to see if it even works?