With the shop wanting to charge you big for the parts cannon approach, looks like you have to diagnose this yourself. You have to get the hose off coming from the drive to see if you have flow there, if not the problem is likely in the water pump or plumbing in the lower unit. If you have good flow at the transom the problem is elsewhere, but not the risers cause there is no flow getting to them. Then, find a new shop that doesn't just guess at problems and make assumptions.
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