I recently aquired an el2 that i gave been using fine for a couple weeks. Today, i went to take the first picture of the day, pressed the shutter button and the mirror raised, but the shutter didn't open. After some troubleshooting, i am 97% certain that the self timer is engaged, but is not ticking down. The lever moved very freely between vertical and horizontal, but does not seem to count down. Does anyone have experience with this? Will i need to take it to a repair shop, or is there something simple i could do to fix it? Thanks for any help.