Took my 357 SR1 Kaama out yesterday and discovered someone had loosened all connections at the hydraulic outdrive steering cylinders.

The problem: I can't find any place to refill the hydraulic fluid. I've traced the lines from outdrive to steering wheel and there are no reservoirs or fill plugs.

Anybody know how to refill this system?

Is there a steering pump? if there is, you simply top off the pump resevior.
If not, I've seen some where you fill at the helm unit. But you have to keep turning the steering wheel lock to lock to get there air out. Then fill again. Don't fill while turning.

Just refill at the power steering pump. You'll have to do it while running the engine, turning the wheel back and forth. It takes a while to get all the air out, but thats the easiest way