This amp's power filter capacitor was weak. I allowed a friend and old electronics tech to replace the cap. Without my permission he decided to "improve" the sound by adding a "secret" capacitor (see yellow arrows below) trick. I suspect that my friend didn't know as much about the "secret" capacitor as he thought he did. In any event when he returned the amp it didn't work ....power wouldn't even come on. A closer look revealed why: At the red arrows below notice where the power carrying wires from the switch are melted for about an inch from their solder points on the switch (switch-pot) and an inch completelyburned out / gone on one of those power wires. No other componants looked nor smelled damaged, ....so I am guessing my friend's idea was to increase current that had worked in other amps for him, but he miscalculated and the current he induced popped the missing componant and got the wires hot enough to melt in that split second.
This amp's model, circuit and wiring look the same as the other Blue MOTS Maggie amp ( #1 ), excpt that this amp's power filter cap is internal while the other amp's is mounted external with the tubes; Surely just a design change between a couple years difference in age (this one the later version evidenced by it's "refrigerator" handle).
Otherwise this amps componants look to be in pretty good shape, particularly for it's age.