Returning result from one column if criteria are met in multi columns / rows

I have a spreadsheet where some equipment checks are done. There are 11 columns/checkpoints and one with the issue description. If the checkpoint is checked and there's no problem, then the operator puts " OK " in the row "OK" If something is wrong, then "NOK" and column 12 puts a short issue description.enter image description here

I need the formula to search for example rows with the week number 33, check if there is any "NOK" record, return the number of "NOK" and return the description.I was trying to use IFERROR but even when NOK is present, it still returns "No NOK found for Week 33" Please see the formula below:

=IFERROR(INDEX(O2:O22, MATCH(1, (B2:B22=33) * (D2:N22="NOK"), 0)), "No NOK found for Week 33")