ONKYO CD RECEIVER Black CR-U1 - Malfunctioning

There are operational issues.
Set includes: Main unit, 2 speakers, remote control, power cord.
The 4 items listed above are included.

[Condition]
The main unit and speakers have some minor dirt and scratches.

[Operation Check] Items not listed have not been checked.
▪︎ Power ON/OFF
▪︎ Disc tray open/close
▪︎ Various buttons on the main unit
▪︎ Sound output from left and right speakers
▪︎ Sound output from earphones
▪︎ Sound input from LINE
▪︎ Remote control: Buttons below volume could not be operated for CD playback, etc.
(Buttons including and above volume work fine.)

[Operational Issues]
* CD reading fails approximately 1 out of 3 times during loading.
* After reading failure, the unit occasionally freezes and becomes unresponsive, or skips tracks.
* Once, the left track button skipped past track 1 and displayed 99 due to a bug.
* The stop button occasionally caused a malfunction (right track button).

[Specifications Unknown]
* LINE input volume was lower than CD playback, etc.
* The disc tray started reading even without a CD inserted, and could be opened after reading.
* Some vibration noise was heard after CD reading.

[Shipping]
The main unit will be placed in a waterproof bag and shipped in recycled cardboard, etc.

Please understand and agree to the following:

▪︎ YuYu Mercari便 and RakuRaku Mercari便 may be changed as needed.

▪︎ This is a used item, inspected and shipped by an amateur.
Please understand these points before proceeding with the transaction.

▪︎ The color may vary slightly due to smartphone camera accuracy and lighting effects. Scratches may be difficult to see in photos.

▪︎ Refunds cannot be issued after purchase due to reasons such as it's different from what I expected.

Please feel free to comment with any questions beforehand.