I have a long list of MissingWebPart showing up in the health analyser. I don't understand why they are showing up because after a spot check, I see that the web parts are actually there. For example, I have the following error
[MissingWebPart] WebPart class [07f48b68-2e69-c86a-ebe4-16359e03ebc2] (class [Microsoft.Office.Server.Search.WebControls.AdvancedSearchBox] from assembly [Microsoft.Office.Server.Search, Version=14.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c]) is referenced [1] times in the database [WSS_Content_Customers_Portal], but is not installed on the current farm. Please install any feature/solution which contains this web part. One or more web parts are referenced in the database [WSS_Content_Customers_Portal], but are not installed on the current farm. Please install any feature or solution which contains these web parts.
I checked the database and see that this web part is on _catalogs/masterpage/AdvancedSearchLayout.aspx. When I browse to this page, the page loads just fine. The advanced search box is present.
The missing web parts lists all appear to be related to search and reoccur overall my sites.