I can not find what this is, we are stumped. PN appears to be SMP D4002, but google is no help.

 

Thick film resistor? Can you read the second line on it?
Like these possibly: https://www.ohmite.com/catalog/hvc-series/HVC0402E5006KET

 

Thick film resistor? Can you read the second line on it?
Like these possibly: https://www.ohmite.com/catalog/hvc-series/HVC0402E5006KET

Unfortunatly no, those are the best pics i could get.