Former hedge fund manager Whitney Tilson got caught on the wrong side of the trade in shorting cult stock Tesla  (TSLA - Get Report) a few years back. 

But he warns that the time for Tesla's stock to go down a good bit is fast-approaching. Tilson reveals several concerns to TheStreet that Tesla fanboys should keep in mind. The warning arrives before Tesla's likely contentious annual shareholder meeting on Tuesday. Proposals are in the mix to oust Elon Musk as chairman and sever ties with three board members.