[ICOM] More on my Pro3 pwr issue

[KI9A at aol.com]

OK, need some ideas here, gang. Would like to cover all bases before losing 
 my rig for a few weeks at the shop.
 
My P3 has an intermittent power issue, here is what it  does.  
 
When turned on, shows 90-100 watts, key down, all bands, into a dummy load, 
 and antennas. I hear the fan kick on during xmit. After about 30 seconds 
of cw,  or SSB, the power drops to the following:
 
160m  8w
80m  40w
40m 30w
20-15-10m 8w
 
If I leave the rig turned on, it will recover to full 100w in about an  
hour. If I turn it off, it will recover in about 15 min. Which almost leads me  
to think its a poor solder joint, or something other than a failed PA. 
 
Am I right thinking this???
 
I did switch out power cords, eliminating the fuse issue. My 50a PS is  
working fine, no drop in current or voltage at any time. All connections are  
tight. 
 
I have googled the heck out of this. No joy...
 
Any thoughts? Having a hard time thinking its a bad PA. I guess it can be,  
but, conventional thinking says it either works, or not.
 
73- Chuck KI9A