There should be very little to worry about except for different amounts of packing on top vs bottom possibly resulting in physical damage, but you would see that, and increased potential for capacitor oil to leak. But most any tech should be able to check that for you unless opening the case invalidates whatever warranty there is. There may be other problems but I am not aware of them.
Shipping amps upside down?
I recently recieved a used amp that was shipped upside down. The sender will remain nameless as he is a decent guy and went out of his way to get it to me quickly. However the fact remains that the address label/postage was on the bottom of the box (which was the top for the entire trip, even with all the *up* arrows pointing the wrong way) The trip was probably close to 3000 miles, but was shipped essentially 2 day air. I cannot hear any parts rolling around and it performs like it is supposed to as far as I can tell (but volumes are low right now as the wife and kids are sleeping) I have heard horror stories about electronics being shipped upside down. But in my case should I worry or not? The amp is SS but it weighs in at 50 lbs. Could there have been damage that will show up in the near or far future? If I sell this amp in 2,5,10 years should I still be concerned about it? Sending it back to the factory for a check-up probably involves another 6000 miles of travel. Would more harm than good be done by that?
It just bothers me to have to worry about something like this.
It just bothers me to have to worry about something like this.