Complaint was the freezer was not cold enough. The refrigerator has no error codes

Complaint was the freezer was not cold enough. The refrigerator has no error codes. The PCB board on the back has an LED light that is blinking two times. From the service manual, the two blinks mean there is something wrong with the wire harness to the compressor or the compressor be bad. Checked wire harness and everything looked ok. I reset the refrigerator (unplugged) and the refrigerator started cooling and the LED on the board stopped blinking. The unit cooled correctly for a few days. Now the refrigerator is not cooling at all. Neither the refrigerator or freezer section is cooling. No error codes again. The LED light is blinking twice again and compressor is running. Checked for sealed system for any visible oil leak and couldn’t fine any. unplugged unit. The LED stopped blinking, but the refrigerator did not start cooling. Any suggestions?