What was found
DURING CLIMB THROUGH APPROX FL200, NOTIFIED OF A DIRTY DIAPER ODOR IN AFT GALLEY. ISOLATED THE PNEUMATIC CROSSBLEED AND SHUT OFF THE NR 2 PACK. FA STATED THE ODOR DISSIPATED. PERFORMED INSPECTION OF THE NR 1 & 2 PACKS RAM AIR INLETS. NO CONTAMINATION NOTED. CREW PERFORMED ENGINE RUNS WITH CROSSBLEED VALVE CLOSED. NO ODOR NOTED. APU INLET PLENUM CLEAN. BOTH PACKS WERE OPERATED FULL HOT & COLD. NO ODOR NOTED IAW TSM 05-50-00-810-831-A, AND AMM 21-00-00-810-801-A. ACFT OK FOR SERVICE.