Had similar problem on 364 which uses same control unit. On this one the draft control spool valve attachment point for the chain broke. The chain was in intact but several links had a lot of wear.
We just replace a the chain with a hardware store chain of similar length and link size. make sure you replace the protective sleeve over the chain to protect it from wear. You may want to inspect the draft control spool valve chain attachment point for wear or cracks. If you have removed the unit it is pretty much in pieces you may want to replace the o rings and seals to ensure smooth operation. For the 364 there was a couple part numbers for rebuild kit with the seals and orings.
Also you may want to consider replacing the gasket on the bottom plate to prevent the unit from leaking hydro. fluid into the transmission housing if you have to pull the hydro unit.Thats a hard leak to fix once it back to assembled again.The factory manual has excellent descriptions on how the control functions and service/troubleshooting info.
good luck/ be patient /and extra clean and you should ok.
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