how can i fix my cuckoo clock?

my cuckoo clock had been on the wall for almost 15 years and has never missed a beat. My wife was dusting it and apparently it came off the wall in her hand. The result is that the cuckoo clock door now does not shut properly once the cuckoo has finished cuckooing and the cuckoo noise is very weak. The clock did not fall off my wall but the resulting damage seems odd. I have taken it locally without success. I understand that they are not the easiest of things to work on from the inside. Wonder if anyone can help. Within reason, I'll send it to someone to fix outwith the Highlands/Scotland