The short answer is probably ‘yes’. You can repair anything if you want to, but it isn’t good economics.
The last time I checked the cost of repairing a control panel for a retic box it was around $150.00 at an electronics specialist. Then there is the removal and replacement – allow another $150.00 and you are already close to replacement cost, but with no warranty.
So in short – like most things these days a retic control box is a disposable item, so my advice is to get one with a decent warranty.