100K Maintenance

Hello everyone,
my 09 tsx recently hit 100k, and the maintenance code B124 cameup. I went to the Acura dealership in Virginia and the service advisor gave me an estimate of about 1800 for all the codes.
for now i only did the detailed checkup with oil change.

the dealership in Ohio said, Acura doesn't have timing belt, but chains.

i just want to know what kind of maintenance should i be doing at 100k miles.
any suggestion to save cost will be appreciated.

thanks