Tech, or should I say technical, issues are at the heart of “Bombshell” after the production heads to Boston and loses its Joe DiMaggio. From a desk being too large, a leading lady with a bad case of the nerves, a director who can’t keep his hands off said leading lady, and a failed marriage proposal, “Tech” presents an excellent look at what can go wrong with a Broadway production before it actually reaches Broadway. Talk about an awful lot of drama!