Thank you for your answer and your concern.

While I'm not experienced in refrigeration, I have refilled my cars air conditioning systems several times in the past, and I have a degree in engineering and work in that field.

I will certainly be careful to learn everything I can before I attempt to work on it (if I actually do so). In fact, that's why I'm asking these questions. I'm trying to find out what my options are.

Thanks again, I appreciate it.