Suspected Oil Cooler Leak - How to fix "spring clip" joint?

[Chaldaean]

My B3030HSDC sprang a leak and I think it is coming form the "spring clip" joint on the hydraulic oil cooler.

Best case, the fix is to install a new $1.54 o-ring and I'm good to go.

I don't know what the worst case is, but I'm here to try to avoid it.

Does anyone have any previous experience with this?

Thanks!