For your info, it was the second time that the a/c (A330-300) had to return to KUL caused by smoke warning in the flt deck. The first was on 12 Nov from KUL to MNL when the warning came on and the crew declared an emergency. The a/c landed uneventfully. After going through with Pratt and Whitney reps, it was found OK. Unfortunately, it had recurred on the way to ICN. On ground, MAS Eng found the cause was from APU oil leak seeping through bleed duct. The crew never reported about any smell though.