[Kenwood] MC-85 Low Output

[K3AC at aol.com]

Recently acquired an MC-85 supposedly working. On putting in new batteries  
- it had essentially no audio output - no movement on the audio meter and  
connecting it to the rig - barely any audio unless I whistled into mike, and 
 then minimal output unless mike gain was cranked all the way up on mike 
and rig.  With Comp on - there was some small movement of the mike audio meter 
and some RF  output, but still low. Opened up the 
bottom panel of MC-85 and everything looks fine - nothing loose, no mods I  
can tell. (I did push the correct mike button (I, II, III) - it only has 
one  cord attached to button I). Any ideas? Any thing to check for 
troubleshooting? 
 
Thanks,
Bob, K3AC