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//0. user enum field code
$CODE = "UF_CS";

//1. Local cache
$arEnumsCache = array();
$arResultSectionsByID = array();
foreach ($arResult['SECTIONS'] as $key => $arSection)
   $arResultSectionsByID[$arSection["ID"]] = &$arResult['SECTIONS'][$key];

//2. Make same GetList as component did
$arFilter = array(
   "ACTIVE" => "Y",
   "GLOBAL_ACTIVE" => "Y",
   "IBLOCK_ID" => $arParams["IBLOCK_ID"],
);
if($arResult["SECTION"]["ID"] > 0)
{
   $arFilter["LEFT_MARGIN"]=$arResult["SECTION"]["LEFT_MARGIN"]+1;
   $arFilter["RIGHT_MARGIN"]=$arResult["SECTION"]["RIGHT_MARGIN"];
   $arFilter["<="."DEPTH_LEVEL"]=$arResult["SECTION"]["DEPTH_LEVEL"] + $arParams["TOP_DEPTH"];
}
else
{
   $arFilter["<="."DEPTH_LEVEL"] = $arParams["TOP_DEPTH"];
}
$rsSections = CIBlockSection::GetList(array(), $arFilter, false, array("ID", $CODE));
while($arSection = $rsSections->Fetch())
{
   //3. Check if section is in the result
   if(array_key_exists($arSection["ID"], $arResultSectionsByID))
   {
      //4. Simplify processing of single/multile properties
      if(!is_array($arSection[$CODE]))
         $arSection[$CODE] = array($arSection[$CODE]);

      foreach($arSection[$CODE] as $UF_ID)
      {
         if($UF_ID > 0)
         {
            //5. Check for local cache
            if(!array_key_exists($UF_ID, $arEnumsCache))
            {
               $rsEnum = CUserFieldEnum::GetList(array(), array("ID" => $UF_ID));
               $arEnumsCache[$UF_ID] = $rsEnum->GetNext();
            }
            //6. Modify result
            $arResultSectionsByID[$arSection["ID"]][$CODE][] = $arEnumsCache[$UF_ID]["VALUE"];
         }
      }
   }
}