Hi.
Since the fuses blow, the wisest, safest, and in the long run cheapest option is to take the head to a tech.
The fact that it was cheap(ish) shouldn't IMHO affect Your desicion whether to have it repaired or not if the tone is to your liking. Within' reason obviously

.
The way I'd look at it is that the head has probably paid itself already, so as long as the repair bill is less than a price of a similar one, it's a win.
Regards
Sam