"O"rings that operate in a contact then no contact operation will accumalate debris as the lube acts as a glue in a air circuit
lube will also slow down its response as non return valves need to re act quickly
these "O"rings dont actually move on a surface but make contact ie up and down in other words they just touch
assemble dry and make sure the block ahs been thouroughly cleaned, believe it or not best to rinse with distilled water
Another reason NOT to lubricate your EAS Valve Block or EAS Compressor is that WD40 (or any other oil-based product) together with TEFLON (where the EAS Seals partly made of) is not a good combination. Before you know you'll have to replace the EAS seal because of a mall-functioning pump.
Your Range Rover EAS system is a dry-air-system. Keep it like that.