Worth seafoaming a Yammy 3000 iSE before replacing carb?

mlts22 wrote:

It will be assumed that they do the usual diagnostics to fix the issue,

BAD assumption.

You need to explain the "issue" and tell them you want that fixed.
Then if you want additional routine maintenance done, tell them that TOO. The two may not be related at all.

YOU MUST BE SPECIFIC or there is a good chance you will end up disappointed with the results.