Orion GT420 missing parts

Orion GT420 missing rectifiers and a transistor in the power supply section. I could not find service manual.
Any help would be vastly appreciated.
 

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Thanks but it seems I cannot source 2N5639. I do have D1303 and J112. if I match the pinout will this do the trick ?
Any idea if Orion used some specific rectifiers or I can put regular common anode/cathode like mur**** series, considering voltage/amperage ?