Upon arrival system cycled on. Main concern was that the furnace wasn’t working correctly. Went into the attic and found that the issue with the furnace was intermittent, Diagnosed intermittent issues with control board. Pulled board out and found a cracked solder pin connection. Performed safety inspection on the furnace and found and are of concern at cell #2 through the blower cabinet at the back eyelet. Went over options with homeowners, they want to wait and discuss things amongst themselves. Signed Safety 1st form. HVAC intermittently operational at this time.