The machine predates the time that Doosan started creating MTE manuals, (Maintenance Technical English) and ISE manuals (Install Service English) so the only manuals available are the ones that originally were sent with the machine. These have actual part numbers to there editions that are sorted by Machine Serial Number.
Please contact you local dealer to purchase replacement manuals of PLE (Parts List English) OPE (Operation Programming English) INE (INstruction English) or the Electrical Diagram (which has its own code format to its version.