OK. I am deep into this now...spent parts of the last 3 days scraping the bowl and lid. I found 5 holes. All are small and 2 are easily plugged with small screws. 3 are a little more complex because of the location. 2 small holes are right under the welds of the handle for the lid...one on each side. The other one is behind one of the straps that holds the charcoal grate. Putting a washer & nut there would likely alter the strap.
Suggestions on holes under handle and behind strap, please.
Also, there is a grey discoloration on the lid. Scraping and scrubbing have made no difference. I assume that this is simply heat related and will not change. Correct?
Pictures are in this link. Camera is not that great, but will show what is needed.
https://goo.gl/photos/U6TPrmXWWCx8ggyZ7