Nobody should be doing RCA for the sake of doing RCA. RCA is just one step towards the real goal of
preventing recurrence. If the "self audit" activity is really important, the monthly results should be mandatorily shared with his/her line manager. The problem would have been uncovered after 1 month and not 6 months later. On the other hand, this exercise may have shown that the self audits were totally useless, by the simple fact they were not performed/reported for half a year and nobody noticed.....