Guide star acquisition failures often result in pointing control by only one of the planned two FGSs. The DA should use centroiding techniques to look for motions. Past reports can be found off the OPUS web home page. For such obsets, the database cannot be relied upon to track the fact that the obset was on a previous SMS and left unexecuted. You should prepare the report itself with standard contents in a standard order.
Past examples are available on the web.
You can mix and match the statements contained in the boilerplate to assemble a report that most closely applies to your particular situation. At the beginning of the report, you should write a paragraph that describes the failure succinctly, with an accurate description of the failure, the target's name, identification of the observations involved and the date of the observations. So that the message is intelligible to any astronomer, acronyms and HST jargon should not be used. If the failure involved a target acquisition failure and it is possible to determine how far the aperture was from the target when the observations were made, that information should be included. Also, if it is obvious how the observer can avoid this kind of a failure in the future, this should be mentioned.