If it's anything like the 1987 300D, all I can say is "good luck". It's a very unpleasant job as the hose assembly is a 3D jigsaw puzzle to snake in & out... NOT fun. Took me 2-3 hours last time; I've done this twice now. At least it's a lot cheaper to rebuild than to buy a new one (~$75 vs. ~$400!)
Regards,
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