The Radio Information Board

I have an Icom IC-2710 Dual Band , The left side on VHF or UHF works fine on receive but when i switch over and use the right side VHF or UHF the receive signals are very weak like the 10db atten is on, when it not, one night the radio started working fine on the right side until i tapped on the front panel and the receive is weak again. what I am thinking it might be a cold solder joint somewhere and as small as that board is and finding it will be a job, does anyone have any input on this?