What was found
NR 3 MANIFOLD LT, ILLUMINATED PASSING 3000 WITH FE STANDARD PANEL SETUP. ENGINE WING ANTI-ICE ON PRESSURE WAS 60. FOLLOWED QRH AFTER PHASE ONE PRESSURE, REMAINED AT 40. THROTTLE BROUGHT TO IDLE, PRESS DROPPED TO 20 DURING RTB TO MEM FACT, 11NOV06 20:47 MEM. REMOVED AND REPLACED NR 3 MANIFOLD PRESS SWITCH. LEAKED CHECKED SWITCH ALONG WITH SENSE LINES. LEAKED AND OPS CK GOOD. PERFORMED DECAY CHECK WITH APU AND NR 3 ENGINE. BOTH TEST PASSED. REF DC10 JRH 7-11 AND 7-12. REMOVED AND REPLACED NR 3 ENG PSC, CKS GOOD, REF MM 36-27-01-2. TAXIED ACFT TO HIGH POWER PAD. RAN ENGS IAW JRH PRESSURE. REGULATION CKS GOOD. NR 3 ENG HIGH STAGE VALVE OPERATION CKS GOOD. WING ANT-ICE CKS GOOD REF MM 30-11-00-2.