Arrived on site to perform fall tune up on a 4 year old Goodman unit. Client stated no issues and all is working good. Cycled unit. Found filter dirty and client replaced filter to prevent dirt entering system or system over heating due to restriction. Blower assembly has slight dust. Motor is good inducer motor is good and range. All electrical and safety switches are operational . Drain lines are clear but due have debris and dust from dust entering unit. Found no safety over flow switches on either drain lines and recommended adding one to prevent any Over flow in attic. Ducting is good and new R8. Found no protection on high efficient systems. Recommend adding surge protectors to system to protect from electrical surge and power outages that can damage or even short out systems and components. Cycled unit and replaced filter. Went over all findings and areas of concerns with client. Client is aware of recommendations with system and he did hold of for. Ow just wanted to see so he