The problem with all the F keys on your Lowrey organ is probably an electrical one.
I have no idea where you reside, so I cannot search for a repair service in your area for your Lowrey organ.
I suggest you take your question to an online discussion forum focusing on organs.
The Organ Forum is one: https://www.organforum.com/forums/forumdisplay.php? 20-Electronic-Organs and https://www.organforum.com/forums/forumdisplay.php?35-Home-Organs
Registration (free) and login are required to post a question.
Answers & Comments
Hello, Lucy -
The problem with all the F keys on your Lowrey organ is probably an electrical one.
I have no idea where you reside, so I cannot search for a repair service in your area for your Lowrey organ.
I suggest you take your question to an online discussion forum focusing on organs.
The Organ Forum is one:
https://www.organforum.com/forums/forumdisplay.php? 20-Electronic-Organs
and
https://www.organforum.com/forums/forumdisplay.php?35-Home-Organs
Registration (free) and login are required to post a question.
Best wishes.