I got a set of rebas back off a mate after lending them to him. They’re leaking from the flood gate and the lockout not working. I imagine that the little o ring under the flood gate has moved but unsure if this could effect the lockout as well? Lack of oil maybe? Going to strip down soon, but what seal kit to buy and from whom?

If they’re leaking from there then they will have lost some damping oil and the lockout will stop working pretty quickly when that happens. I’ve had this too and it was the funny big double lip seal inside the moco damping unit at the top that had gone wonky over time and started leaking. Replacement came with a standard reba service kit.