Came out today to inspect a leaking high efficiency Lennox furnace model #EL296UH090XV60C-03, serial #5912H28991. Upon arrival the homeowner showed me a puddle of water under the back of the furnace. I powered the system down and removed the access panels. There are no signs of water in or near the inducer motor or anywhere near the blower motor. The leak is isolated to the back of the system. The humidifier sits on the back of the system. I opened the humidifier and noticed that the humidifier pad was covered in this clear gel. This humidifier was not serviced by chud this past year. I recommend performing humidifier service and the homeowner agreed. I replaced the #35 water panel and cleaned out the housing and drain line. I powered the system back up and tested for proper operation and leaks. The system is operating properly at this time.