Not sure if this with work for you, but try telnet-ing into the system (Procomm perferable).
Then us the command "session start"
It will return a file of "*.maintenance.session_log" (Make a not of it.)
Then enter "stat 1"
This will spit out all IP PLIDS and it's status.
You will see PLIDS that are Out of Service, Idle, and Busy.
Next enter "session end"
Then enter "print *.maintenance.session_log/port lpr3"
Now, be sure your windows PC can "print to file" using a "generic" print driver.
You may have to set this as your default printer on your PC.
Then in the Telnet session enter "en pr/n"
Depending on the telnet software you use, you may be able to cd the CD light flashing.
When it stops, enter "<ctl>C" and your terminal will return to normal.
At some point your PC will ask you where to save your file. This is actually a dump from the 3300 of what you just did a stat on.
Save it as a txt file. i.e <file.txt>
Once you have the file, import it into Excel. From there you can sort on the status of the PLIDS.
You may have to play a bit to see what you need to, but you should be able to track it down.
Mind you, it will only show the PLID and it's status. It wont show the extenson number.
Ralph