I was in a very similar situation and decided to stay on for 2 more years, and while it seemed an agonizingly long time it was well worth it. I was 55 when I retired under the 80 point rule (age plus service).
I am in a similar situation. We're more than ready to go now, but DW's mega corp will subsidize health care between retirement @55 and medicare to the tune of $500/mo if she stays on 18 more months. Basic $60K decision for us. "We" (if she has to work, I have to work ) are gonna stick it out for 18 more months for that.
Whatever you do, I wouldn't give up the grandfathered pre-ACA plan. We have one of those and are very happy we do as most of our docs do not accept Covered CA.
Does the 2 years of part-time work count towards the 70 years that you need?
Read the SPD closely - do they have a right to terminate the retiree medical plan at any time?
Read the SPD closely - do they have a right to terminate the retiree medical plan at any time?