My 1991 Hurricane/Godfrey Deckboat has been tough to steer for years at idle/slow speed. It was fine at operating speed so I assumed power steering pump was weak or belt slipping. Pulling into dock last weekend and felt a "pop" in the steering wheel and lost steering. Wheel won't turn. (thank goodness for trolling motor and no wind that day!). Power steering belt appeared to be toast. Thought easy fix and replaced belt. Still steering locked. I figure one of three probs: 1) Power steering pump 2) control arm/slave cylinder (whatever it's called) or 3) steering cable. Seeing the belt stretched made me assume PS pump, but I run engine and it's not destroying new belt so I'm leaning towards steering cable replacement first. Any suggestions where to start?