Mike,
There is no directory for these kinds of issues. You simply have to do you homework before you even consider buying any gun.
For example, in this particular case I was not clear on what the specific problem was with model based on your brief description...In less than 2 minutes I was able to find numerous internet sources that clearly stated the apparently well known issues with this gun.
Here is one example...
I would get your 742 to a good GunSmith ASAP! The new 7400 Remington came out due to 1 serious problem with the 742 rifles.( Sloppy Owners). The rifle will fire when out of battery.
This dangerous & possably deadly condition happens in most part to shooters, who don't keep their bolt and raceway area of their Recievers clean. Inthis case the bolt won't close & that is why they can fire (Out of Battery) an un-encased cartridge. That is as bad as it gets, & usaully results in a bad injury or death.
(Basically itis well known fact that these guns will fire out of battery.)
The easiest way to find to this typeof information is through the use of Google. In this caseall I had to do was to search "742 Remmington problems" to get the all the information I needed to prevent me from purchasing these guns.
Hope this helps...
JC