Panasonic SA-BTT775GA Service Manual page 69

Step 5 Upset the unit.
Step 6 Release 2 catches.
Caution: During assembling, ensure that Tray Ornament is
properly inserted & fully catched onto Tray.
Step 7 Remove Tray Ornament in the direction of arrow.
Caution: During assembling, ensure that Tray Ornament's
guide rib is properly inserted onto Tray.
Step 8 Slide the tray in fully as direction of arrow.
69