I accidentally found this thread. Believe me I have changed around 4 units if inverter AC frim PEL, Haier and Kenwood during last 4-5 years. All of them had the same problem uband of indoor unit was leaked. My recent unit's uband was leaked. It is a Dawlance mega T3 series. I thought it will last long but it leaked under 8 months.
After going through this thread I came to know about vacuuming. Guys, I am about to receive a new Dawlance mega+ T series 1 ton unit tomorrow. Is it a recommended series or I should not go for it. Also, let me know of technician who will perform installation after vacuuming. I am based in Karachi.