Re: Caught squirrel attic, don't know where the entry hole is. Help?
Speaking from experience (ugh!) reds can get in anywhere there is a hole in chewable material large enough to get their teeth into. They will chew until the hole is big enough to enter. Charley Chuckles has a good idea - go up there and turn out all the lights. Before your eyes get used to the dark, look around for light entering. Also, from the outside, check your soffits - especially where gables bee the roofline. These are areas where they can comfortably sit and chew. And chew. And chew ... until voila! they've made their door. Vented soffits (if you have them) that are in these areas are particularly vulnerable.
Your idea is a good one too - not sure about a bunch of people standing on the roof - they might be able to get a pretty good idea from the ground.
Most important, do go into the attic with a good light and check everywhere for a nest with babies in it. They will die without mom or without your removing them and becoming their surrogate mom.
Good Luck!
Jamie
"some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence