I did call REC again last night, and they are sending someone out this morning to check it out. However, they will not go inside the house, but only check out everything up to the meter (which is all I was asking them to do in the first place). Managed to get a 3/8 allen wrench to fit in the end, all though it took some gentle persuasion to actually get it seated in each lug. All seemed tight. Tried another electrician as well, to check everything else and he'll be there this evening or tomorrow morning.
I've been working in the basement constantly, while this has been going on, and have never heard buzzing, and I know what that's all about, from past experience. I'm pretty well convinced it's something between me and the transformer 2 poles down, or it could be that ancient throw disconnect on my pole. Either way, it's nothing I can handle, so I'll let the pros take care of it. Thanks to all for taking a few moments to try to help.
