As a matter of interest, I note that you are not going to unseat the bowl glass but just empty it, refill and de-gas the liquid. Before you go down this route you ought to tell/ask yourself this. Fluid was lost last time so unless you correct something, fluid will be lost this time. It might take a bit of time but it WILL leak again. Leaks never improve with age. Just my thoughts based on my limited experience since.............. a long time