I bought a Behringer Euro PMP1000 500 watt mixer / amp for £30 from Gumtree sold as 'spares or repairs'..
PSU / Amplifier section
Mixer section screen cover
Additional screening cover for mic / line preamp section
8 SMD resistors blown. Replaced with through hole types..
All done.. The parts cost me a grand total of £1.70 including postage, as I had to buy a pack of 100 resistors..