One of our member sold his FC (mark 5) in mint good condition for RM43k. If urs is a mark5 u can sale it between RM35k - RM45k. Mark 4 abt RM28k - RM38K in good condition. I suggest u repair the unsolve problems before u sell it.
i think the price can be pretty determine by your potential buyer..more over i think the repair cost will also need to be taken into considerations by both parties..