Warmer (but coldish) fridge - normal freezer - frost builds up

Hello.

I have an Indesit IN-C 3100 G.1 fridge freezer. A few weeks ago (coincidence) the bulb got burned. After replacing it, and a few weeks that have gone by

1. The upper half of the fridge started collecting frost (at temp indicator 1.8 of 5)
2. When reducing this back to 1.5 (which I had for about 10 years like that) - the ice started melting to the upper half but temperature has gone higher.
3. With setting at 1.5/5 temp is about 12C-16C (bottom to top of the fridge) while when at 2 temp only falls to about 10C and ice starts building at the back again.
4. Freezer works just fine as it is.
5. As of yesterday I defrosted the fridge (the fast way oil and some pots with warm water), and as of today frost at the back starts to build up.
6. On this Indesit fridge there are many things I do not recognise. I cannot see the “holes” for air circulation (maybe where the light is behind) and there is a wire that goes somewhere I do not recognise and cannot see at the manual.# Since always - the bottom right of the fridge always collected in the corner a bit of ice that I had to remove every 2 months.

Unfortunately, access is extremely hard thanks to the guys who fit it in this flat - making it almost impossible to have access at the back - as it is free standing on four poles to keep it higher.

ANY type of suggestion would be appreciated on whether I can examine anything or troubleshoot from the front of the fridge before having to move at the back of it. So to rap it round: Freezer is ok - within a period of 5 days frost started to build up (with setting at 2/5) bringing the frost almost touching the shelves - dropping temp to 1.6/5 frost started to melt but butter was ready to spread on bread. Did a defrost - freezer still ok (coil have not started to build up any frost on them - fridge has the same problems. This is on the same day I plugged in. Currently temp is about 10C.

Thanks v much. Not having access to the back does not allow me to follow instructions on the internet.

Thank you very much for the reply. It was great seeing s reply from you actually - was gonna reply with this article. I will now attach two pictures:

1. The first one is a cut on the seal that I have with bogus methods taped - what I am not sure if how long this hole is there

1. As I was looking for holes two days ago I found another on the main metal frame. This seems to exist there for years though - most likely before I moved in. I have sealed that too

1. Extra? Would you know exactly what this is on the last photo?

Any good idea on the best possible way to seal? I have used duct tape temporarily. I guess the cheapest and fastest thing to do is to replace the seal and see then before I have to move the fridge which is nearly impossible - I mean if you move that one better replace the whole fridge.

Than you again and super greatly appreciated! All the best I wish you. If you also recommend I will change the seal and come back to all. Thanks.