mate, no way should you pay to understand if its warranty or not!
The headlight washer not sitting back is a known fault on e90's fixed under warrenty. That reminds me, need to get mine fixed!
You may recall, Blue Bell tried that with me, but didnt tell me upfront - I came back to a £100 bill for looking at a hole underneath caused by road debri when I had just asked to quote me for the new panel replacement.
M6 & Family 5er