What was found
WHILE IN CRUISE, AT FL360 DUCT SPLIT NOTED. LT 34 PSI N2 87.3, RT 8 PSI N2 87.1. TECH SERVICES REQUEST TO T/S AND REPAIR RT ENG PNEUMATIC SYS. ACFT GROUNDED. R & R THE FOLLOWING ON NR 2 ENGINE 390 PRECOOLER CONT SENSOR REF 36-12-03-000-801, 36-12-03-400-801. 450 THERMOSTAT REF 36-11-05-000-801, 36-11-05-400-801. PRECOOLER CONTROL VALVE REF 36-12-02-000-801, 36-12-02-400-801. ACCOMPLISHED REPAIR CONFIRMATION FIM 36-10-00-810-804. FAILED CHECK WITH NR 2 ENGINE DUCT PRESSURE REMAINING AT 0. FOUND CONTACT NR 2 OF AIR COND ACCY UNIT CONNECTOR D10002A PULLED FROM BACK OF CONNECTOR. RESEATED CONTACT REF SWPM 20-71-11. NR 1 ACAU OPS & GROUND VERIFY NORMAL REF MM 21-51-02. NR 2 ACAU OPS NORMAL REF MM 21-51-02. GROUND VERIFICATION OF NR 2 BLEED AIR REG SUCCESSFUL REF WDM 36-11-11 AND OF NR 2 ACAU REF MM 21-51-02.