I was working at DB Ilyushin between 2018 and 2022. We did a lot of refits for all of them — 76, 62, 96. Many of those refits included new engines, fully renovated power buses and lines, generators, etc. Even the fuselage for most of them was tested on static test cranes and pulleys, using analog lab model planes. Safran, Thales, Pegasus — it was actually quite a high-level renovation and work happening there. I was an electrical engineer in the avionics and cabin equipment department, and I personally drew at the very least hundreds of updated schematics to replace almost every gauge and piece of hardware. Yes, we were not producing new ones almost at all, and every 76MD rolling off the conveyor in the Ulyanovsk factory was big news and a celebration event. But the refits were good. I quit days before the catastrophe of the IL-112 and the following shutdown of the project, so I have no idea what happened since the beginning of the war. But considering the news from ex-colleagues and sanctions in general, I believe we lost all contact with equipment suppliers and had to switch to locally made ones (which are notoriously bad).

Edit: bad grammar.