I wouldn't mess with it too much because
of the warranty. I'd probably take it back.
Do you live in the US?
The 350 combo goes for about $400 now
days. They were a little cheaper around
Black Friday. MF has a used one for $210.
I got my 350 head around Black Friday. It
list for $550. It's odd, but they sell it for
$400 also. Mine was a display that no one
ever seemed to use. They had it on sale
for $250 as new with warranty. They were
offering a special 15% discount. So it was
$212.50. I traded in two used basses and
ended up paying $86 for a new 350 head.
I use it with an old Fender M-80 1X12 cab
I got off CL for $60.
It runs at 175 watts with one 8 ohm speaker.
I have another 12 inch, 8 ohm. If I hook both
speakers it runs at 350 watts at 4 ohm.