2014 volvo D13 780 oil leak (oil piston control valve - oil thermostat valve)

hi wondering if any one have this issue before ?? oil leak in this area of engine between i think is starter and oil filter , did my research find couple pic and one video on youtube , find problem related to those part 23013334 and 23013323 (oil piston control valve - oil thermostat valve) , i dont have any cheek engine or any symptom issue when i driving or any other, its just oil leak around those part ,
part price Volvo D $210 can-dollar for 23013323 oil piston control valve and
$320 can-dollar for 23013334 oil thermostat valve.
i pulled DY those part out connect 12v DC nothing wrong with valve work fine both, the only think not sure its case the leak its O-ring seal , if i replace the O-ring seal only you think will fix the leak or the leak come from the valve it self ?????? i attach pic for the valve and my truck leak area .
thanks for any help

 

Hi Mudman78 , So the leak from the valve, both valve needs to replaced ?? .
can i just replace the O-ring rubber seal ???? the valve is working i test it . thanks

 

Thanks a lot for the gold info