Jeff, Chromo is right- there are some amazing trouble shooters on here who will catch this hopefully today. Little spots are not my specialty - if there are no little bugs visible through a scope- I had it over to my partner IF it meets another criteria - new growth is effected.

If the new growth is looking good you may have less to worry about, because if it is caused from nutrients then the problem is fixed if your new growth looks healthy. BUT spots like that would have me looking through a scope daily and keeping a close eye - other than that I would do just what you are doing- calling in the partner to check it out….. lol!

Good luck and I can't wait to see what the experts have to say!