See EEVBLOG >>2465 Teardown( 75 pages)
Check Condor Audio in Isreal and Qservice in Greec for repair/refurb tis and pars
Get full service manual for your model and serial, W140, Bama Archive, Vintage TEK museum
Follow procedures for check and repair flow charts.
Full printed many very handy avail from Artec manuls
Bon Chance
Jon
Jean-Paul