What was found
DEPARTING KDAL CLIMBING THROUGH FL190, OBSERVED FUMES IN COCKPIT. ODOR WAS ACRID & INCREASING INTENSITY. DECLARED EMERGENCY & RETURNED TO KDAL. ON LANDING & SHUTDOWN, THERE WAS NO DISCERNABLE ODOR IN CABIN. STILL ODOR IN COCKPIT. FIRE DEPART CHECKED ENTIRE ACFT WITH A TEMP GUN. EVERYTHING IN COCKPIT 90 F EXCEPT MFD IN CENTER. PEAKED AT 130F. REMOVED ENGINE IND LCDS & INSTALLED OVERHAULED LCDS, OP CHECKED GOOD. REMOVED FAULTY MFD & INSTALLED REPAIRED MFD. PERFORMED OPSL CHECK. ALL CHECKED GOOD. NO FAULTS FOUND. WORK PERFORMED IAW AMM 77-40-00, 34-25-01 AND 34-25-02.