Hi ,
I also had the same kind of a problem in my Premio and got the compressor valve replaced by Toyota Lanka after paying Rs. 23,000. But got the problem again. Then I consulted Lalith Aircon at Maharagama who imports lot of auto Ac parts. He had the ND Japanese made compressor with the same part number for 60 K which I bought. altogether it cost me around 70 K. Running ok for last 8 months now.