I have a 2003 410 Sundancer with 3126 Cats that recently had the top rack adjustment (valves and injectors) as part of the 250 hour service (currently have 300 hours on motor) and now the starboard engine is hard to start when it has been sitting longer then 20 minutes. The engine will crank for about 10 - 15 seconds before starting but once it starts, it runs fine. The port engine starts in less then 3 seconds no matter how long she sits. All primary and secondary filters have been replaced as part of the service. I had the Cat technician come back out and he wanted to start randomly replacing parts at my expense. He indicated that it sounded like the check valve(s) that is part of the transfer pump, part number 7W-7383 and I have the parts manual for the 3126 (attached photo - Item 14 points to the check valves (2 listed)) . Does anyone have pictures of the actual pump with part locations when looking at the pump? Is this easy enough to replace by a mechanically savvy person? Thanks in advance for your insight.