No. I would try Deoxit. If that doesn’t help, I’d guess that it’s a dead tact switch. I’ve never replaced any on my Elektron’s, but I have done several on MPCs—it’s usually pretty easy (simple soldering).
Elektron support may be able to get you the part or point you to a supplier.
If you suspect it’s dust I wouldn’t spray anything in or on the contacts without cleaning the dust off first. Get some cotton swabs, a small brush and a can of compressed air and you’ll be able to get dust out of most places.
Personally I would opt for some 99% isopropyl alcohol for cleaning contacts, I also have good experiences using kontakt 60 for cleaning, kontakt WL for washing away the cleaner and then finishing it with kontakt 61 for protection. CRC also makes various cleaners and lubricants but I only have experience with the 2-26 electronic contact lube, which works well but still requires cleaning beforehand.