Do you mean the typical fixed window in your entry door.....inside/outside frame with glass between......
The inside frame comes off (screws)
Glass is set in outside frame using sealant and sometimes small blocks on bottom
If sealant dries out and/or blocks slip the glass will slide down
When removing inside frame have a helper outside to hold frame glass so it doesn't fall out
Clean up, install new sealant to hold glass in place...new butyl tape around inside & outside frame.
I followed pretty much the same procedure. Used black silicone and re-bedded the window. Problem solved.
During the fall. I winterize WEEKLY. I run a fly fishing business early fall and hunt later fall so this requires me to winterize every week when I leave. I've done this hundreds of times, probably more. Drain all holding tanks. Empty the hot water heater (I do not by-pass until winter lay-over). Blow out the lines, opening each faucet individually to drain. Open the low-point drains. Drain fresh water tank (if used). Use bypass on fresh water tank to draw up 2 cups of red pop. Pour 2 cups in traps - Done. Never a problem in 9 years.