What was found
AFTER ROTATION EXPERIENCED FAINT ELECTRICAL, BURNT / OVERHEATED BRAKE ODOR. WENT AWAY, RETURNED AFTER 5-6 MIN AND AGAIN 20 MIN INTO FLIGHT. EACH TIME A LITTLE STRONGER ODOR. NO INOP FANS, LIGHTS OR ASSOCIATED MESSAGES. ODOR MAINLY IN COCKPIT. 2 TIMES ON APU BLEED, 3RD, TIME ON ENGINE BLEEDS. LANDING UNEVENTFUL AND UNDERWEIGHT. PULLED PFDS FOR T/S. INSPECTED AND CLEANED PFDS, NO FAULTS NOTED. R&R DISPLAY COOL FILTER IAW AMM 21-24-15. FOUND IMPROPERLY SEATED RT BOOST PUMP SWITCH AND BROKEN OFF LANYARD. NOTICED BURNT ELECTRICAL SMELL ON CAP AND SWITCH. R&R CAP AND SWITCH. OPS GOOD.