Thank you all for the well wishes!
This update is a bit late...
LFTs were high on a Wed as stated previously. I went in the following Fri and AST/ALT were down a bit but Alk Phos was up a bit. Feeling a bit better about those results, we left for a week of vacation as planned.
After getting home, 8 days later, I went in for labs Mon morning and everything was back to normal without any intervention.
I'm beginning to think the spikes aren't the Keytruda but perhaps linked to drinking alcohol in moderation. I was never a heavy drinker, maybe 4 drinks a month... after diagnosis I stopped almost completely, but on occasion I'll have a drink and these spikes seem to happen after that. Maybe a coincidence, maybe not. I've now stopped ALL alcohol and will see... I won't miss it a bit.
I'm scheduled for Keytruda #10 this Wed.