Pushrod O-Ring Replacement

Following my functional check flight after my second 12 month/100 hr. inspection on my engine  I found oil seeping from both tubes on #4. It’s not a lot, but enough to blow around onto other components and a small area on the firewall.  The engine is just over three years old, been in service since July 2019, with 99 hours TTSN,  it’s a 912UL flown regularly and faithfully maintained by the manuals.  Makes no sense just these seals on just this cylinder would fail so soon.  All the others are dry. Can this be a temporary condition caused by something or am I looking at replacement? Update: after wiping everything dry and flying again, no trace of oil found. Perhaps oil that dribbled down onto the coolant radiator during my oil change, which was then was blown back onto the return tubes and pooled at the seal lips.