4) Based on the appearance and/or reported age of the foundation (or sections of the foundation), it may not be reinforced. Foundations without modern reinforcement such as metal "rebar" are prone to failure during earthquakes. Typically, concrete foundations built prior to the 1930s, or brick foundations built with "header" courses, are not reinforced. Consult with a qualified engineer to determine if the foundation should be replaced or repaired.
5) One or more support posts were not positively secured to the beam above. While this is common in older homes, current standards require positive connections between support posts and beams above for earthquake reinforcement. Recommend that a qualified contractor repair per standard building practices. For example, by installing metal plates, plywood gussets or dimensional lumber connecting posts and beams.
6) One or more joists were spliced with "sistered" lumber, and no support post was installed below. Sistering is a common repair practice where additional pieces of lumber are attached to spliced pieces. Such repairs result in a component that's weaker than the original joist and should be reinforced with a support post below. Recommend that a qualified contractor repair per standard building practices. For example, by installing support posts and footing below.