Damages pressure & Tank pipe swopped on pilot control block

[Sutton]

I have a ASV RC 50. It has intermittent steering issues. This lead me to remove the pilot control block. This was reinstalled after being repaired at a hydraulic shop. After a few failed operating attempts. I realised i had accidentally connected (swopped pressure & tank pipe to the pilot block. Correcting the pipe work, had no results fixing it. I have no hydraulic activities/movements at all Further fault hunting, i found the spool valves, both safety and DA now stuck(beyond repair or cleaning), on this pilot control block
Question: what damages can be caused to other devices on the machine due to the swopper P & T pipe. What should i do fixing this?

 

[Sutton]

Fault rectified.
Turned out the hydraulic system was badly contiminated with dirt in the oil. 4x oil flushed further, new oil filter and a new joystick to get it working as it should.