I have a Yale ERP030THN36TE08C S/N F807N02999C that is intermittently losing drive and displaying code 43L and sometimes 90L both I understand are left drive motor temperature issues. the physical external temperature of both left and right drive motors when the problem has occurred has been 71 degrees F. the computer however is showing the right drive motor is very constant at 17 deg C, but left drive motor fluctuates between 20 to 70 deg. C. during normal operation, but randomly jumps to 280 deg C for a time and locks out drive and sets the codes. after a few minutes the temperature will drop to 20 deg and function normally. Is this normal for a temp sensor when going bad or do I have a controller issue? Is the temp sensor in the motor, or in the controller? what is the best procedure for troubleshooting? Thanks in advance.