I vaguely recall some people re-soldering their optical connections to the board, maybe with mixed results. Screens seem fairly easily replaceable, but require very gentle hands. Both topics have been covered a bit in the past, try a Search to see if you find anything.
What condition did the EBay seller claim before you completed the transaction? Both of those are problems that IMO should be noted pre-sale, and if they misrepresented the JB3s condition, I'd get a refund and buy one direct from Creative or from someone here who's (probably) more trustworth.