What was found
AS TAKEOFF POWER WAS APPLIED ACRID SMELL DETECTED BY FIRST OFFICER THEN CAPTAIN, NOT VISIBLE, LOW SPEED REJECT AT 50 - 60 KTS. SHUTDOWN ON RWY & TUGGED TO GATE. SMELL WENT AWAY WITHIN MINUTES OF REJECT. NO HEAT DETECTED BY CRASH CREW. NO CB IN FLIGHT DECK WERE POPPED. R & R LT & RT PACK COLLESSOR SOCKS IAW MM 21-51-16-03. INSPECTED 101 VU PANEL FOR CHAFFING & ARCING IAW TECH TIP 2-0513, PERFORMED POWER ASSUR RUN IAW JRH & DUCT BURNOUT. NO UNUSUAL SMELLS NOTED, EXCEPT A FAINT GLYCOL SMELL, WHICH SOON DISSIPATED, OK FOR SERVICE.