Can you clean it up and identify the leak(s) before you pull it out?
I haven't had one yet that I couldn't reseal. The FSM provides detailed procedures and tool part numbers for removing the seals. None of the sealing procedures involve messing with the critical fine internal adjustments.
A stock box that "works great" is a fine thing indeed. If all it needs is to stop leaking, then that is a lot less risky than rolling the dice to see if you like the performance and feel of a completely different box, regardless of who does the work or how they set the box up.
I'm suggesting that you identify the leak(s) under pressure before the box is removed and then completely reseal the box.