i have an old EoTech 517 on my AR-15, i went to go show it off a little and when i tried to turn on the sight it wouldn't turn on. does anyone have experience troubleshooting these? i know that they had issues back then with their sights and there was a lawsuit and a recall, but i would rather not have to throw this optic away, it's been good to me for 10 years or so. the batteries were corroded and slightly expanded when i opened up the optic (i forgot to remove them before i 'safed' my gun). i've cleaned up all the corrosion on all the contacts and and put fresh batteries in it still won't turn on. can anyone help?