NPTO? I'm taking a guess this is the suspect system
FCC Callsign WREM734 (NEPTUNOMEDIA, INC)
www.radioreference.com
According to your display this is SYS ID 1 SITE ID 99 Color Code 1
Utuado PR aka "Site 99"
Assuming the above is true, you should have a site created that looks like this..
451.1125 LCN 0 Color Code 1
452.8000 LCN 0 Color Code 1
463.6500 LCN 0 Color Code 1
464.0500 LCN 0 Color Code 1
Run the LCN finder as others have mentioned and wait for the results.. (It may take a while or not complete if some frequencies are not used)
If this is the wrong license just substitute that info using this as a template..
Then record what the actual LCN # should be and program the frequencies with that number. (0 is just a placeholder and the scanner will not trunk track the frequency) You must save the results of the LCN Finder then review what now has a real number (instead of a 0) saved for each frequency.