Need a second opinion on my X5's suspension - dealer says both air struts

Need a second opinion on my X5's suspension - dealer says both air struts are leakingI've got a 2016 X5 with the air suspension and the dealer just told me both rear air struts are leaking and need replacement, quoting me almost 12,000 dirhams for the job. The thing is, my car doesn't sag overnight and I haven't noticed any unusual noises, just a slightly rougher ride over speed bumps. I'm not saying they're wrong, but I'd really like a second opinion from someone who knows these E70 air systems well before I drop that kind of money. I've been looking for  BMW Garage Experts in Abu Dhabi  who can properly diagnose whether it's actually the struts or maybe just a leaky airline or a failing compressor. Has anyone had a similar situation where the dealer was too quick to condemn the whole air suspension? I don't mind paying for the repair if it's truly needed, but I'd hate to replace both struts only to find out it was a cheap O-ring somewhere. Any advice on what to ask the independent shop to check first would be massively appreciated. Thanks.