Earlier this month, we starting having problems with our sewer line; it began with the downstairs toilet flushing very slowly, then not flushing at all, then backing up when the upstairs was flushed. After consulting with the previous homeowner (a contractor), he advised that the sewer line was probably frozen (we live in Fairbanks, AK). We called a thawing company, they can and steamed the line, and everything was copacetic.
Fast forward to two days ago. Same symptoms started appearing; very slow flushing downstairs toilet, but the shower and sink drains run fine. So, we called the thawing company back after plunging, running a closet auger down, etc.
They came out and found that the line was not frozen, and checked the vent stacks... One of which was frosted shut. They steamed both vent stacks, and called it a day.
Now, the toilet is still flushing very slowly. I'm not sure what else to troubleshoot; I'm now out almost $500 in steaming service, and I can't find a plumber that can come out until next week. Suggestions?