Can anyone recommend a good Pentax specialist camera repairer apart from the official Pentax Service dept?

I have a pentax LX with does not work properly with its motor drive. I have tried another drive but the same fault appears.

The camera fault is that it only takes 1 frame when the drive is used. If you turn the drive off and on again its works but for 1 frame only.

Any experience of Pentax LX repair companies is welcome.

Regards

Nick C