If you don't use FM a lot consider replacing the 15 kHz 9 mhz pre filter
FL23 with a 6 khz filter.
This filter is about 2/3 of the way back just left of center on the main
board. It looks like a crystal with 3 legs.
You can get it from ICOM for $18.00 plus shipping.
It is 9M6A1 FL-116 6kHz BW: part number 201 0000 950.
You do have to lift the main board to replace it but it isn't that hard
to do.
Also check out Kiwa (http://www.kiwa.com/) He has a 3.8 khz filter module.
73,
Chuck