just did my cooling coil replacement at kelvin workshop yesterday, promotion still on.
my 2nd time replacing cooling coil, the last time was 2.5 years ago at another workshop.
my FR is that this time, beside Kelvin and his assistance, there is another new mechanic(didn't ask for his name) who is very experience and knowledgeable. I feel totally comfortable with him too. He help to repair my water tray which was apparently cut by the previous workshop when changing the cooling coil(

).
and for those who wanna change aircon compressor, I would only say the price quoted by kelvin is cheaper than all prices I have seen quoted by other workshop in this forum till date.