Sketch-up dae collada model problem

Hi everyone 

Wondering if anyone could help me. I made a sketch-up drawing of a theatre. Exported this to Collada file. In this file all the colours of the walls look right.

When i import the file into Augmented however, the colours change.

The left side of the proscenium is brown -- instead of black.

In the auditorium one wall panel is also a different colour than all the rest, again no idea why.

Any ideas, thanks!! 

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