Lights in the unit weren't working so I replaced both with new bulbs and now the GDO won't open the door, from either kelyless remote or hardwired wall unit, nor will the new 60W lights in the unit turn on. both sensor lights are working (green and amber). unit has power as I checked the outlet and I can hear the relay clicking for both the lights and the door but nothing happens. noticed the 'learn' light flashes 5 times when I push the door button. Is it circuit board, the unit, or wiring that's toast? Is it fixable by a DIY guy?