I visited Courts to look at the models they carry. I did ask about re-doing the pipes. He told me that copper should last 25 years. I am a bit dubious that things lasts so long

Will visit the showrooms of Daikin and Gain City & one of the things I'll ask them is their opinion about this. Suspect that the only way to tell is to do a visual inspection.
For me I will go with a re-piping. I actually want to ask them if there is an option to have larger drainage pipes. Does anyone know if using larger pipes will help avoid the common problem of water leaking

This usually happens when the drainage pipes get clogged & water leaks the wrong way. Hoping a larger pipe will reduce the problem of clogging
From my visit to courts I found out that almost all the aircons they carry are made in Thailand. Only the Panasonic brand is still made in Malaysia.