We had a slightly different issue like this a few years back, where a bird got stuck behind the kitchen units - not a clue how he got in there, but we could hear all the chirping. We contacted local vets etc until eventually someone put us onto a park ranger! He came along and located the bird (a baby blackbird) - but he did it with lights and mirrors - no way would we have been able to do it.
I don't have contact details or anything like that, but this was in East Cork/West Waterford area - feeling the ranger might have been in Waterford area.
All we did was keep ringing different people until someone was able to help - as we hadn't a clue what to do.