Found 1999 Trane RTU leaking water into nail salon below unit. Accessed RTU and found significant corrosion around compressor which has led to several holes in bottom of chassis. When raining, water will travel through unit. Called service manager who assisted in creating estimates to repair system as well as replace system. Advised client that repair is not recommended and cannot be guaranteed long term. Client wishes to bring recommendations to property owner in hopes that they will share responsibility for either repair or replacement. No further action necessary at this time. ----- System reactivated.