My 2007 gt G6 has 207,000km but has been well maintained. The hardtop pump reservoir has needed top-up fluid every 4 or 5 cycles. But now the top won't go down at all. The cycle won't even start by lowering the windows. I get "Top Complete" when I press the up button. But when I press the down button, I get an intermittent "Top Not Secure" message, even though the top is tightly secure. No movement at all in the top mechanism, not even a sound. I'm thinking no power, but I have checked the fuses. Could the reservoir be too full? Any suggestions, please?