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1. Loosen the door from the opener [there should be a quick release on the chain/gear] and manually run it through the problem area, see if there's a palpable snag.
2. If you have the electric eyes, make sure they're not getting misaligned or obstructed by the travel of the door.
3. Check and see if your opener has a sensitivity setting. If so, open it up a little.
4. Check your manual and see if the '3 blink' is a specific problem code.
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We need the kind of courage that can withstand the subtle corruption of the cynics - E.W.
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