GPU overheating on AIO 7760

So, i`ve paid 2000$ last year for 7760 AIO system with geforce 1050 only to encouter an enormous waterfall of problems. I will now talk about the major one, since i ve managed to deal with the others.

There is an engineering issue with the cooling system. THREE times this desktop have been carried into service with GPU overheating problems, one time with thermal paste change (it was just non-existing out of the factory) and two times Dell was sending replacement parts for the cooling system. All of this has been working for 2-3 months with the same problem reappearing after. Now my one-year guarantee has expired, 1050 is still reaching 90° in a moment during heavy load and then the whole system is instantly shutting down. I don't want to pay money for the Dell service, which won't work, so my question is - is it possible to fix this cooling problem with some additional third-party resolution? Maybe i can install another cooler on gpu chip or traverse additional heatpipe through motherboard? I have attached the photo of the M/b, you can see the problematic gpu chip right at the end of heatpipes.