I am looking for the Service Advisory or S.I. for the evaporator housing drain tray campaign #512. The S.I. number is 4/86-837. I have parts from a later car (1993) to perform this to my 1985 Turbo but would like the factory bulletin before I go drilling holes in my really clean, nice car. I have tried several sources and seen reference to it but can't find it. If you have dealer records, the file location as Sec. A-8, p.97 of S.I. Supp. No. 6-A! How is that for detail!