The guy at the shop said the two were bad. I would like to know if they are bad or if they are clogged and I can send them away to get cleaned. What are the procedures to test if I can. Thanks!

get a long screw driver, and put it near the injector while the car is running, listen for clicking(when fuel is injected)

I would think the diag would say two banks are misfiring so it would behoove you to find out what is causing that. I would think also that a mechanic would listen for the injectors rather than just rattling off what the computer says and call that legitimate problem solving.