Mercury 90hp 4 stroke efi with command thrust

by Serg
(Jacksonville, Fl)

Intermittent squealing when at low rpm or idle, especially when turned full to starboard. I think it is in lower cowl because I can feel the vibration at the starboard upper engine mount rubber cover. There is no belt, impeller recent serviced, no power loss, does not seem to be rpm dependent. Wondering if a bearing? Thank You for any Suggestions.

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