Just received a notice of Non-Renewal for my 1977 Cessna R172K XP. Have had my PPL for 2yrs now, approx 275 hrs of flight time, I keep the plane in a hangar, meticulously maintained, and have spent almost $75k for a top end overhaul, avionics upgrades and both full interior and exterior restoration since purchasing the plane 2 yrs ago. The only thing that’s changed since my last renewal is that I turned 50. The notice gave no explanation for the decision. I’ve emailed the underwriting department, but no response yet. What am I missing?