DVDR80 uk model drive/laser replacment

My dvdr80 has had a hard life in the last 2 years working as a cctv recorder and recording and then playing bace in excess of 2000 hours of wideo at the 8 hour setting.

Now my recorder is retired of that job and to celebrate it has started not reading comershial and burned dvds also the recordings are very hit and miss. mostly miss.

i have looked but have not found a thread on fitting drives to this machine .Is this posible and whats involved.