Dutch, I own a '03 MA FL/CUM 400 and had a loss in power. Found several issues. First was the air charge cooler was leaking bad but was able to get it repaired at a good radiator repair shop. Second was the filter. On my unit there was only one filter smack in the center of the rear bumper assembly. Had to use a filter pliers and a drywall sanding screen to keep them from slipping as Godzilla installed the first filter at the factory. With all the bio-diesel on todays market you must use a biocide or you will have all sorts of problems with your engine not performing right or your genset having issues. You probably are going to have to dump in the additive run it a bit and then change the filter again. Once I did, mine runs great, good luck, Walt
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