Arrived on site performed annual inspection and boiler cleaning. Upon inspection found 1. Customer has a failed can vent on boiler. Recommend replacement and purge 2. Customer has 3 sharkbite angle stops in hallway bathroom. Recommend compression or sweat angle stops 3. Customer had issues with back to back toilet siphoning out. Recommend repiping with two separate tee wyes and tying back into main drain. 4. Customer has improper tailpiece on hallway lav sink. Recommend proper tailpiece to be installed. Gave options and customer would like to get everything done at a later date.