no audio, pairing ok, connection ok, no sound , reset wont help

After 3 years Bose Soundlink III stopped working, tested everything following the users manual regarding reset actions but still no sound.

Pairing : OK

Connection : OK

Battery : OK ( green led when holding on/off button for a few seconds)

Music from connected device : OK

Volume to max : OK

AUX selection : led’s OK but still no output to speakers

In my opinion there must be an error in the amplifier area, there is only a little noise in the speakers noticeable when you hold the speakers to your ear (quiescent current).

Has anyone some experience with this error ?