Not sure if you already pulled it, but hopefully these few things can be helpful. I reset an FG 180 this year and found these to be some of the trickier issues with it.
-super tight fit (as mentioned by others)
-lots of glue, including between the sides of the body and the engrain of the heel
-The one I worked on had a shallow dovetail and the air space behind it fell short of the 15th fret, so getting my probes in the right spot (via fret slot) was tricky
-I used steam and dry heat but still could not pull it. It was wiggling A LOT but the fit was still so tight that it would not pull. I ended up sawing through the fingerboard at the 11th fret, removing the portion covering the joint and inserting probes directly between the dovetail cheeks and the pocket. Came loose after that—Phew! Hopefully it wont get to that point for you. But if it does— don’t sweat it, everything went back together just fine and it only needed minimal finish touch up.