Wanted UltraAnalog DAC 003 Chip

Hi, need help to find the Ultra Analog Digital-Analogue Chip 003 found in the heart of my Langevin 20 Bit DA Converter. My technician suspects the chip is faulty and needs to be changed.Thanks
UA no longer exists. There's no way that you can test the chip to see it works before installation. I'd look for a new dac.
I'd say give the folks Parasound a call.