Work permit/ visa advice for Malaysia

I have an urgent and necessary contract in Malaysia for 7 to 10 days, that only a very specialist team of 4 experts from Europe can do. There is no one Malaysia that can do this work. I have a contract and it will mean being in Malaysia for between 10 - 14 days working at a power plant from 9th March to around the 20th March. Obtaining an invitation letter from my client will not be a problem.