TC feedback cab light unable to turn offeven when cab light switch is in OFF position. ~~~~~ 3510 TC feedback cab light unable to turn off even when cab light switch is in O  position.  3510 Check cab light switch ok. Depress cab partition door switch, cab light switch off, cab light relay did not de-energise. Further check found cab partition door switch terminal with water and oxidation. Replace cab partitin door switch and function test cab light on/off ok. Apply some plastersine at cable gland. Done by Saini/Zulq 45252