What was found
FLT # 1979. DCA - FLL . " AFTER TAKE OFF , DIRTY SOCK ODOR PRESENT IN TH FLIGHT DECK FOR SEVERAL MINUTES ODOR WAS MILD BUT NOTICED SEPARATELY BY BOTH CA AND FO . ODOR DISSIPATED AFTER SEVERAL MINUTES . ODOR NOT DETECTED BY INFLIGHT OR PAX.; ACCOMPLISHED VISUAL INSPECTION OF APU / APU AREA . NO OIL LEAKAGE OR RESIDUAL FOUND . OPENED ENG #1 AND #2 FAN AND CORE COWLS . NO EVEDENCE OF OIL LEAKAGE FOUND . INSPECTED PACKS BAY AREA AND NO EVIDENCE OF OIL FOUND . INSPECTED ENGINE SPINNER AND NO EVIDENCE FOUND PER FAULT ISOLATION PROCEDURES J21-22-00. "