I doubt it's a fuse issue, blown fuse would trigger an error message, can you see any sign on the indicators near the switch that you gave the lowering command?, the down arrow should flash or get a chime or something unless the switch or that circuit is at fault and even though you press the selector down the sytem does not get the command.... was the suspension recalibrated after the lift?
My friends call me Fery
2000 Discovery Td5 ES manual
Hawkeye v.6, Nanocom EVO,
VDM UCANDAS, oscilloscope
if you think my english is peculiar it means you didnt hear my japanese
ALL MY ADVICES ARE BASED ON MY OWN KNOWLEDGE AND MY WAY OF UNDERSTANDING THE DESCRIPTION AND OPERATION OF SYSTEMS... I'M NOT A LAND ROVER TRAINED SPECIALIST JUST AN ADDICTED ENTHUSIAST.