Hey john,
My fridge was turning the bench top into a hot plate, it was like a food warmer when it was over 30c so I pulled off the outside vents and found that the rear of the fridge was venting into the open space around the fridge, it is supposed to be sealed up so the hot air vents to outside. What I did was fill the cavity above the fridge with some roof batt stuff then panelled it in with ply so the air will be vented to the outside, to help this along I mounted 2 computer fans which you can see here;
http://www.expandasdownunder.com/threads/drovers-14-44-3.4502/ I found some 12v power and hooked them into it via a 70c thermo switch which I got from Jaycar for $5.75 it clips onto the condensor fins and switches on when needed, there are also open cable runs at the top and bottom vent areas which will need to be filled in, styro in a can or silastic will do, as the hot air will blow into your cupboards space you need the air to come in at the bottom and run straight thru the fins and outside quickly, thus the 2 fans. I actually think a 60c or 50c thermo switch might be better bt you need the one which closes at these temps. I have found on 30+c days my fridge is set at 3 maybe 4, I have yet to test it out when it hits 40c but it's colder now at 3 than it ever was at 7. I can't take credit for this mod though as I got the info from on here and other forums, luckily I had most of the bits needed so it only cost me $5.75. But it is well worth the effort no special tools needed , a bit of ply or thin alloy, some cable, zip ties, silastic, thermo switch, cable joiner, spade joints, 2 computer fans and I used some square conduit cut to size to mount them. I also put an in line fuse for the fans and mounted them so if one craps out it is easy to replace .
I thought I had a pic of when I'd finished the panelling but can't find it.