EX2200 - Junos 15.1R5 - broken Temperature Sensors

Hi,

it seems there is something broken in Junos 15.1R5 with one of the temp sensors:

root@switch> show chassis environment 
Class Item                           Status     Measurement
Power FPC 0 Power Supply 0           OK        
Temp  FPC 0 GEPHY1                   OK         20 degrees C / 68 degrees F
      FPC 0 GEPHY2                   Failed    
      FPC 0 GEPHY3                   OK         20 degrees C / 68 degrees F
      FPC 0 GEPHY4                   OK         35 degrees C / 95 degrees F

{master:0}

How can this be fixed ?