F5061's are narrowband compliant by programming; there is no modification necessary other than changing the programming to make sure all of the "W's" have been changed to "N's", changed CTCSS/DCS tones are in place, and checking that the radio is aligned.
In the past year I have been "in" so many radios I can't remember which is which. I started putting a sticker on the ones that have been reprogrammed to help sort them out.
My guess is that it's a "happy sticker" from the shop. If in doubt call them.
COML, Public Safety Communications Consultant, Interoperability Crusader, Firefighter, and Slayer of Dragons (aka Proprietary Systems), K9PKE