I have an Ameri- King AK-450 ELT which came with my model 111 project I see there has been an AD issued on this model as well as the newer 451 what would be my best option as far as getting an safe operational elt? Take this one to a shop and have it gone over, or being rather old scrap it and lay out the money for a new one I do not have an antenna for this one and before spending money on one I would like to hear your opinions about it.Thanks Greg