How to Check WDATA for presence of Audio Content?

Hi all - Does anyone know how to check DCC91 WDATA line for presence of Audio Data ?

Trying to determine whether recording issue is within the TDA1316 or further up stream in the Digital Board. I don’t have another W/R PCB to swap out unfortunately, But TDA does not appear to have any shorts on head drive outputs and does seem to switch the head channels as seen on the scope, head coils reading all ok and not open or short around 20-30ohms.
Thank you, still trying to recover this little decks recording ability :slight_smile: