Hi there, I have a new-to-me GT-541 and I'm ready to take it through a general maintenance cleaning, but I get an error right away. One says "Battery Life", and the next says "Waste Ink Full". There's a brand new waste ink tray, and I made sure the tabs were lined up. The sensor seems to be ok, in that it alerts when the tray is out, but it can't get past the full error. Are there two sensors in there? I can't wait to get it up & running and this is a little frustrating. Any ideas?