[ICOM] Removing FL-53A filter

[Trottman Compound]

I am trying to remove the FL-53A filter from my IC-751A to put in another
rig. I thought it was a plug in filter?? It seems a little hesitant to come
out. Do I need to take out  the circuit board and unfasten some nuts/solder
or something? I can't remember how it went in, guess it was too long ago.
Any help appreciated before I do unnecessary disassembly of the rig.

 

Thanks,

Matt-K7BG