After quite a while hunting around, pulling all the light sockets out, the last one in the string (that i hadn't noticed the 1st two times i checked) had a bent tab causing the GI problem
Vacuumed the cab out, made up a little decal for the back of the cab speaker, put some cables in flexi coil and it is pretty much done now.
So in summary
Cabinet strip back, bog, fill and redecal
New back of cab runners made
Board repair work carried out
New leg brackets and bolts and leg protectors
Polished legs
New DMD
New playfield glass
Repainted coin door
Repainted inside of cab black
Installed touched up and clearcoated playfield
New plastics set
New mummy cover
New welded scoop
Cliffy Protector
New flipper bats, plungers and links
New coil wrappers
New sleeves all round
Full LED fitout
'Rock Me' Launch button
Wiring harness cleaned
Ball trough filed to take out divots