What was found
RT PACK HI PRESS MSG ON TAKEOFF- ABORTED TAKEOFF AT 20 KNOTS. AFTER CLEARING RUNWAY COMPLIED WITH QRH. PACK RESET NORMAL BTMS SHOWS 2,1,1,3 ALL IN GREEN. FOUND LOOSE LIINE ON RT ACM, SECURED LINE, RT PACK PRESSURE NORMAL. OPERATIONAL CHECK WITH APU GOOD IAW AMM. (K)