user error?
I'm not sure you can see those logs from the plesk interface - you would need to open a shell and probably have to view the logs as root. as far as the PSA 'user' I'm not sure there is one - the control panel interface should be wide open to admin [unless you mean you are admin on windows - then you are in the wrong forum!]
Even after all that - I don't think you are going to see rpm install errors in aly of those logs, generally plesk writes it's install logs to /tmp - but I'm not sure if it would place update/upgrade logs there as well.
Your best chance - again from a shell - is to try to install the RPM for the module manually - at least tht way you should be able to -verbose it and see if it throws any errors...
- hope it helps
-sean