Servicer Replaceable Parts -ThinkBook 14 G4 (21DK, 21DH), ThinkBook 15 G4 (21DL, 21DJ), ThinkBook 14 G3 (21A2, 21A3), ThinkBook 15 G3 (21A4, 21A5), ThinkBook 14 G2 (20VD, 20VF), ThinkBook 15 Gen 2 (20VE, 20VG) - Lenovo Support PH