Hello and welcome to the site. I had a MK4 Sunfire that was fine in my house but when plugged into a friend of mine he had a bad hum. Try different rooms on different circuits and see if it makes a difference. He eventually found a circuit that was quiet.
It is not advised to use a wall plug as a source of voltage while testing equipment. There are a number of things why those relays are not closing. Can you take a pic of the board where the fuses are? Did you or anyone else change the small caps on that board? A common mistake on this particular amp is installing caps backwards because the polarity symbol is for positive and not negative like most boards.
Looks a little corroded. Wire and jumpers but it is normal and see that all the time. The brown stuff is glue. And the relays aren't turning on because of protection. Are you using a Variac? Or are you plugging it into the wall?
Fuses F001 and F002 are 8 Amp. 125v
Fuse F003 is a 1 amp 250v
These 3 fuses are the ones on the little board on the left side of the amp. 5 Amp slow blow in the back left corner of the chassis. Use the info on the board.