Hm. I still can't get bolt #3 loose. I got my 1/2" drive, 17mm socket on it, but there's barely room to get it on without running into stuff in the way:
I've liberally (too liberally, perhaps!) sprayed liquid wrench on the bolts. RED: the problem "#3 bolt." Using the socket wrench gets in trouble with fitting (?) with the blue arrow. Using an open-end straight wrench runs into the EGR clamp (yellow arrow). I can't get that bracket off because the nut on the back is spinning, and even if I could, I don't think it would help. I have a ratcheting wrench, but there's not enough room around that #3 bolt head to get in on.
Any other ideas? Can the alternator be removed without getting #3 loose? It's not obvious to me that #2 can be removed the way it's welded to the adjustment rod which goes through a captive bracket . . .