Hello! I have a Brymen BM235 multimeter that worked very well for over 5 years, but as of lately I keep getting InEr error and beep from multimeter even when the probes are not connected. I saw here some threads where it says that is an issue with the firmware, where if you put the switch in Auto LoZ and then quickly move it to another position, the message InEr appears for a second. Mine does this also but the InEr message appears even if i move the switch from Off position to Volts or Ohms. It stays for a second and that's it. I thought it's a problem with the traces on the board and opened it up and checked. The board was a little dirty, I cleaned it with alcohol and greased the traces. I put the board back and after powering it up, I had InEr error message displayed on every position of the switch, with the probes disconnected. After a few cycles of power up and shut down, the error disappeared and hasn't come up since then. I made a photo of the board and uploaded it here. You can see there are two traces that have the green paint washed off of them. Could this be the problem and if it is, how can I fix it?
Thank you.