Its telling you from them fault diagnosis that there is a system fault.
I quote
Acoustic alarm BL2,TL6 & TL7 flashiong.
The alarm is activated if after compressor start up the evaporater sensor does not detect a temp decrease rom 4.5 to 0c within the set up time.
This time varies depending on the external sensor temp.
TL3 & TL7 Refrigerator sensor faulty
TL4 & TL7 Evaporater Sensor faulty
TL5 & TL7 External sensor faulty
Like you say seems to be cooling ok
Personel view that most likley the evaporater sensor has lost it tolerance but ot enough to show the fault.
You could try checking the system which I have done in the past to find system running to spec.
Good old whirlpool to seal these sensors in so looks like a scrapper.
Hopes this helps