Man, Phoenix heat is a whole different beast. Once that sheen disappears you gotta move fast, and I keep a jug of water handy to spray the forms down so the edges don't dry out on me. Waiting for the fingerprint test is the way to go, sounds like your foreman saved you a lot of callbacks.

How far was your probe from the actual intake vents when you took that reading? The gap you described makes me wonder if the probe was ever in a spot that could catch the real heat, or if it just happened to sit in the one cool pocket of the room. Single point sensors only tell you what is happening right at the tip, so placement matters more than most people admit. A 47 degree difference is not a small miss either, that is the kind of gap that turns into a dead drive or a shutdown at 2am. Do you think the probe placement was wrong from the start, or did something change in the rack that made the old spot go cold? Either way it sounds like you already know which tool you trust now.