never engage the blades until engine is at full throttle & always mow at full throttle. let the shop doing the maintenance work know that you would like to see old parts that they have replaced, examples: belts, spark plugs, blades, etc. if they are reputable they will do a good job & let you know beforehand if any major issues come up. do you know last time transaxles were serviced? front end & spindles should be greased at fittings. they should do a battery load test just to make sure new battery has enough CCA'S. as far as billing i would guess between $200 & $400 without major issues. let us know how it goes, thanks Mark