How to service your window unit, old house edition:
Try to open ancient window. Fail. Swear.
Press on the window frame gently to try and unstick the paint (this has worked for the previous 12 years). Fail. Swear.
Bang on window frame semi-gently to loosen frame. Miss. Break glass. Cut hand. Swear.
Stop for medical care. Tape glass. Clean up mess, lay down towels on deck. Finally persuade window to unstick, remove unit. Tape other side of glass.
Open unit. Be so revolted by interior slime and filth you consider just throwing it away, except that window is narrow and it took forever to find one that fit in there in the first place. Plus: waste.
Clench jaw. Carry on.
Follow these directions: AC service
Replace window unit in window frame
Put clothes and towels in wash on STERILIZE.
Disinfect cut on hand.
Make fun of self on the internet and wait to see if AC works when you try it in 2 hours.