Wes is right about replacing all of the Rulon. I did a Puma 2500LSY a year ago and all of the Rulon had lost adhesion and was lose, including the keeper plate and gib Rulon. Doosans are known for this unfortunately. I had 56 hours in the job from start to finish and the machine was down for a total of 9 days. This was 2 guys, my grandson and myself. A lot of the work was done in my shop and I had other jobs in between. The customer bought the Rulon as a kit from Doosan for $500 and I billed close to $6000 for the job. That included removing the turret, slides, gluing new Rulon, scraping, installing everything, checking alignments, and setting all the home positions.
If I was to do it all over again I would probably quote $10K for the Rulon job. The spindle I would probably quote $3k plus parts, but I am cheap and love the work. $20K isn't that far off with the price bearings.