Battery problem

Hi Everyone, Well I got my system up and running saturday, and it seemed to be okay, it was a cloudy snowy day so it was hardly making any power. Yesterday I was at cabin later in the day and all seemed well, CC said it had made almost 500wh of power.
Today I was there again, and I noticed very erratic readings on the remote temp sensor. The readings were changing constantly and reading very high, up to 36C and all over below that. I could also hear batteries bubbling pretty good, more than I expected, as array was not putting out that much power.
Not long after CC was showing a fault F104 - too high battery temp or incorrectly set charge points or shorted battery, are listed as the possible problems. Well, its been very cold here (-30C last night) and it was almost -20C when I was standing there looking at it, batteries are in an insulated box, but it was cold in box too.
Charge points are all to trojan specs. So I'm left with.... shorted battery????
Then I realized the gassing sound was only one battery and upon further investigation I found that the gassing battery's partner in the string was frozen. I just picked these batteries up a few days before Christmas, I checked voltage then and three were 6.28 volts and one was 6.29 volts, so I thought that was OK right? I kept them in the garage at a just barely freezing temp, I had my Iota charger on them for several hours 2 days in a row and they seemed to be charged as my kill- a -watt meter said charger was only drawing about 35watts, so I thought they were good. I had not checked SG yet, as I wanted to do it after they had been charged and equalized on CC.
I took SG readings this afternoon when I discovered this, and the frozen battery was reading 1.150, 1.150 & 1.125 not good right? It's partner in the string said 1.290-1.295 (it seemed to have gotten over charged?) the other string of batteries all were right around 1.275. (These are not temp compensated numbers, I've not got that far yet as per figuring that out).
I am at a loss as to what to do. Is this battery shot? I figure trojan will blame me and I'm afraid it's just going to be a bunch of grief. I expected I would be asking you guys some questions, but I wasn't expecting this right off the bat. Sorry for rambling on, but this has got me kind of frustrated. Any words of wisdom would be greatly appreciated. I'll get on the phone tomorrow I guess. Thanks.