Viren Quit CID in Mar 1999 as per this article.
Drop Out [Monday, March 22, 1999]
http://www.expressindia.com/news/ie/daily/19990322/ile22134.html
B.P.Singh's detective series CID on Sony is making news. The reason is because Ashutosh Gowarikar who stars in the lead role as a CID officer is out of the serial. There are different rumours making the rounds but we contacted him and found him very cool. He was only too eager to clarify that there was no controversy and that it was a mutual understanding because he has started working on his new film. His last film was the Aamir Khan starrer Baazi which he had directed, but it crashlanded at the box office. 'There is no problem at all. I'm directing a film which should go on floor by the end of this year. So I've started working on the script which needs a lot of time and I want to concentrate completely on that'' says Gowarikar.
October
06th 2006, Preview here
https://www.indiaforums.com/forum/post/7232703
October 27th 2006, Written Update here
https://www.indiaforums.com/forum/post/7543559
Yes, we will need help from members for the really old ones. 2006 onwards information is available on the net, bit of 2005 is also there, just need to search a bit, a lot of information is there in this forum itself which started in 2005. Member who are willing to help could dig deep into this forum and find information.Its going to be a collaborative effort. Its going to be a long excercise, lets see how it goes.