It’s a lrv 4L 2000 Has a computer processor but my blue tool will not connect to it.. no pin connector Im going to change the black door open and close contractors next to relay board. But I don’t think that’s the problem. I cleaned all locks and limits well. I found it last buzzing on the 2nd floor when I got there with doors closed. I opened up bottom floor hall door looked up closed it and the car ran down to lower landing and shut down. It had been up on top floor buzzing over night. My first thought was problem with lower lobby hall lock since it moved after I opened it. But the contacts and door mechanics are great. Do you think it could be processor board ? Does Unitec still sell these ? Are they drop in replacements with no programming etc.. ?