I have a 2 year old Kenmore fridge. After sitting 4 months unplugged, we turned it on to find it not blowing cold air. Repairman came out and said it had no Freon, that it must have a small pinhole leak. He thought it would not leak if fridge was on, but because it was off it is more likely to if a hole is present. He added a valve and put in Freon and it worked fine. Now 6 weeks later the freezer isn't getting cold enough to freeze. The fridge temp seems ok. Setting the freezer temp colder doesn't make a difference. Would this most likely be low Freon again? If so, now what?