The GRE PSR-500 does not cover the FM broadcast band, so that suggestion won't work. Also, 162.550 isn't used everywhere. Unless you know that his area is covered by that particular channel, a better suggestion would be to press the WX button and step through all 7 channels.
If your scanner is stopping on a channel/talkgroup, but no audio is heard, it may be a bad speaker or speaker wire connection issue.
If it doesn't stop on anything, it is possible that the solder connection from the antenna to the printed circuit board is broken.
In either case, you'll either need to open it up and attempt to repair it yourself, or send it to a radio shop that will do it for you.
There is a shop, in the Northeast I *think*, that will do it. I don't recall the name of it. A search of these forums may bring it up, as other members have mentioned it.
John
Peoria, AZ