back to basics:-
a) have you tried cleaning the drive?
CD/DVD cleaning kits can be found at cheapo £1 stores.
Use one that comes with a small container of cleaning fluid.
b) disconnect/re-connect the drive's cables, at both ends if possible.
Often this disturbance remakes a dodgy contact.
Google is your friend in such matters. e.g. there is Code 19 information here:-
Please advise back on progress.
Good Luck - Keep us posted.