PKN (40 PLN, 0,63%) Orlen started a hydro-desulfurization unit at its refinery in Plock after maintenance. The unit resumed operations on March 22 after a shutdown of almost three weeks, according to spokesman Dawid Piekarz from yesterday. Our view: The planned shutdown finished in line the expectations without any drop in diesel output. Thus we see neutral trading impact on the share price of PKN.