Canonical preventive maintenance package for the 996

Across multiple top-rated listings, the preventive maintenance package converges on: (1) full cooling-system overhaul — new radiators, hoses, low-temp thermostat, often the 986.2 S front radiator; (2) aluminum front-bumper grilles to mitigate debris build-up on the radiators; (3) second-gear detent spring and ball upgrade (prevents the known second-gear pop-out pattern on these transaxles); (4) IMS bearing replacement if not already done; (5) secondary air pump attention (becomes finnicky with age); (6) AOS (Air-Oil Separator) maintenance; (7) underbody FluidFilm and hardware replacement. Documenting all of this with PDFs is what serious sellers do.