I have a Tektronix 2235 that was shipped from central USA to Toronto, Canada by parcel post, packing material was only ( to my horror ) scrunched up newspaper, and not much of it. I bet that box got chucked around like rugby ball, both sides of the border.
I checked it over pretty close before powering it up, and when I did, it was fine. My hats off to Tektronix, pretty impressive. Neither postal system had any reason to be gentle, no fragile stickers, or any thing of the kind written on the box, just a plain USPS box.
I wonder if your scope has one or more cold ( dry ) solder joints that didn't like the movement/vibration of a road trip. As mentioned in another post, this has all the hallmarks of DC ripple, easily caused by poor connection to a capacitor.