Does anyone know whether and where I can get manuals, circuit diagram or service information for a BSI PSM3/2 power supply, otherwise known as a Uni-T UTP3335TD? The unit is working but needs adjustment, for example the 5vDC line is at 5.21V and the output on the two variable channels is also a bit out. I have tried contacting Uni-T by e-mail and eventually got a very short reply from them basically saying its an older model. On asking whether they had technical documentation for this older model I got a very brief one word e-mail back saying "No".