I have just joined so have to answer instead of commenting (not enough reputation yet). I have one of these receivers and know a little about them (I have to say it performs excellently and is very nice to use).
They are now fairly old so are a bit prone to dry solder joints and dry caps. There are quite a few plugs/ connectors that can occasionally give trouble too.
The power supply uses a linear regulator with about 8v across it at >1A and runs quite hot, which commonly gives trouble and heats up the area around it, resulting in accelerated aging of some joints, caps, etc. A small well shielded and properly bypassed DC-DC buck converter cures this - they are very common and cheap now, well worth doing.
It's worth mentioning that there is a small 3v lithium backup battery on the RAM unit, if this goes flat the radio goes stone deaf (brain dead). I think it's supposed to last many years but there is a procedure for replacing it before this happens (maintaining the back up voltage at all times!) or replacement non-volatile "RAM" units are available (it is possible to reprogram it but it's a bit of a muck about).
There is a very useful and welcoming users group at https://groups.yahoo.com/neo/groups/ICOMR71A/info which has lots of helpful info and supportive members that you might want to join (free). It's a radio that is well worth fixing and (relatively) easy to work on if your temporary repair fails... 73