Hard to tell, the color of fouled PS fluid and axle oil is almost the same when smeared to aluminum alloy engine.

One thing for sure, its a "last-touch" job by casa-with more reason to suspect on poor workmanship, either they did overfill the PS/ damaged a gasket, or axle drain plug was improperly seated/did not replace washer or use threebond gasket.

Kindly post the receipt po to check the latest job done and narrow down the suspects.

I like the orange fat cat