What was found
1) AILERON "B" SYSTEM LOW PRESSURE LIGHT ILLUMINATED ON FORWARD PANEL. RTO AT 20 KTS, SL, 174.3 K LBS, 27 DEGREE C. BEC NORMAL SEE DISCREPANCY 1P FOR RTO REASON.2) ENTERED ON DMI #10731 AS PER MEL 27-16 CAT "C". PLACARD INSTALLED. FOR INFORMATION ONLY.3) REF. DMI #10731 (AILERON "B" SYSTEM LOW PRESSURE LIGHT ILLUMINATED ON FORWARD PANEL. 4) REMOVED AND REPLACED AILERON "B" SYSTEM HYDRAULIC LOW PRESSURE WARNING SWITCH IAW B-727 M/M 27-10-144. OPS CHECKED SERVICEABLE. THIS CLEARS DMI #10731.