Fixing Hilti TE 55 hammer drill

I bought this abused Hilti hammer drill cheaply. It looked ugly but it was supposed to be in a working condition. However, selector switches were stuck and the drill didn&even start. So, I got to open the drill and try to get it working again. The drill was filled with hardened concrete dust which prevented airflow as well as jammed the speed selector switch. Rust was found all over the drill. Electric cable was broken and the electric switch had water inside of it. But .... in the end, after fixing minor things the drill works again. I still have to change the gear grease and clean the outside of the drill, but currently, I&pretty happy with my purchase.