Opened this one up,100uf cap on power board,bulged & leaking,removed HDD to inspect main p.c.b.
Found a whole load of miniature electrolytic caps mainly 47uf 10volt 2-100uf 6.3 volt & 33uf 16 volt,all leaked o/c,replaced all,now working fine,no problems with duff tuning or av inputs.Was quite hard to find caps the right size on e-bay.