My name is***** will try my best to help you with your question.
The electrolytic capacitors inside the organ may have dried up if it has not been in use for some time.
Or there may be some other internal electronic failure.
Electronic testing will be needed to diagnose the exact cause of the fault.
Are you looking to carry out the testing and repairs yourself, or are you looking for a repairer in your area?
An IT engineer may not be able to check it but if there is someone who is trained in electronic repairs and can test electronic components and change them using a soldering iron, then they should be able to help!