Pedal: Platform came off axle which remained in crank
I found a component diagram for these pedals here.

Here's the main diagram:



Looks like all the bearings are mounted onto the axle and secured with a bearing preload and lock nut at the outboard end. The axle and bearing assembly is then threaded into the pedal using the threads on part 2 - that's why the torque spec is printed on its shoulder.

Obviously the retaining nuts came undone. All the balls, cones, bushings and nuts should still be in the pedal body as part 2 should have stopped them from falling out. 

If you un-thread part 2 you can get all the balls, cones, bushings and retaining nuts out. I'd do this over a tray or box to catch the balls and small parts that will fall out. You can then reassemble the bearings and, then thread the assembly back into the pedal body.

You could try re-inserting the axle, un-threading part 2 and see if you can withdraw the bearings etc on the axle.

Update:

You should examine the state of the bearings and cones to make sure they are OK before proceeding with reassembly. Maybe something seized which caused the retaining nuts to come undone.