Final answer:
In the provided text excerpts, there is no mention of Mr. Joe apologizing to Mark after learning about the manufacturing of grills for someone else; the interactions suggest ongoing conflict without any reconciliation.
Step-by-step explanation:
Based on the provided text excerpts, Mr. Joe does not apologize to Mark after learning that he knew about him manufacturing grills for someone else. Instead, we see a series of interactions involving conflict, anger, and accusations between different characters, none of which include an apology from Mr. Joe to Mark regarding grills. The provided texts describe tense situations, and there is no indication of an apology taking place. Therefore, it appears that the event in question does not occur in the given context.