Help: My newly upgraded AA Capitole gives no sound

I recently got back my capitole CD player after a Signature Edition upgrade in AA factory France. It has a serious problem: NO SOUND. Everything else seems to be working perfectly: disc reading, display, control buttons, remote etc.

On three or four occasions I managed to get the sound whilst continuously interchanging the channels on the remote (SPDIF/COAX/T&T etc.) or through the buttons on the player itself but whenever the player is stopped (e.g to change disc or to shut down), the player refuses to produce any sound on resumption of play even though the disc is spinning and the display clearly indicating that it is playing (i.e. pressing play button).

When it does decide to play, it plays flawlessly with wonderful sound until the end of the disc. When it is playing (with sound coming out of the speakers) and REPEAT MODE pressed, it plays on and on for days until stopped. But as soon as stopped, the problem comes back.

Same problem when an external transport is used via digital input.

Checked the internal cables, they are all properly seated. The Circuit Board is in good condition and no visible signs of any damage.

Two-way communication with AA France is almost non-existent and terribly frustrating. Am stuck with a new upgraded player costing over $10,000.

Has anybody come across such problems with their Capitole or Prestige? Can you help in identifying possible causes? Could it be a software/chip problem incompatibility with the new transport (installed FOC by AA factory within the upgrade. The Chip version is 5.6.
Any help would be much appreciated.
Many thanks.