Disklavier

> Dear DUG,
> I have recently added a LINE6 midi device to my Disklavier to connect it to my iPad. It seems to work brilliantly and I am using Synthesia for iPad as a midi playback and learning tool (also great)!
> 
> However I have discovered that two keys on the Disklavier keyboard are not outputting a midi signal (E3 and B2 keys) the LINE6 controller shows no signal throughput when either of these keys are pressed.
> 
> Is anyone aware if this is likely to be a sensor cleaning or failure issue or any way of resetting these keys?
> 
> BTW, if using the standard RECORD function on the piano, the key presses are recognised and recorded, but on playback they play at a reduced level of response, moving as though gently pressed and not striking the strings. Could the record sensors need recalibration, if so, how do I do this?  Both faulty keys are working fine on playback or when 'fired' by an inbound midi signal!
> 
> Looking forward to your comments and many thanks in advance.
> Ian Woof