I have recently shot some Kodachrome 40 Super 8 Sound film and just got it back from Dwayne's Photo yesterday. The colours looked great! I was surprised there was no colour shift and I compared it to Kodachrome I shot new and the results were pretty much the same.
I was shooting film that expired in 1993 but I have kept frozen since it was purchased new. Now keeping your film in the fridge as opposed to keeping in the freezer may have some affect on your film. I was always told by old time 8mm film makers to keep the film frozen if you plan not to shoot for a long time. Since your film expired 5 years ago it might not have changed too much. The only way to really find out is to shoot a roll.
Dwayne's Photo did a good job in developing my Kodachrome film and the turn around time was about 3 weeks from the time I mailed it to the time I got it back.
Good luck!
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