Hello,
I am an old B767-300ER driver (1996-2003), and I very well remember this regrettable accident.
If you check the below link you will find the official report issued by the THAI authorities - very comprensive report.
I think that you will get answers to all your questions. There is even a schematic of the reverser system. The accident prompted a series of modifications, which may be studied on page 36 of the report.
Lauda Air B767 Accident Report
Best regards
grebllaw123d
A small addition: If you need other accident reports, check the database of the following link:
Aviation Safety Network >