For the rebate It askes for the board serial number... I'm not sure which of the numbers on the board is the serial number and I have already installed the board...

On your iPad's Home screen, click on Settings > General and then check through the list, to make sure that you are typing in the correct number:

Model
Serial
SEID

The serial number was on the box. We have no way to know any serial number as each one is unique to each gun.

Some dishwashers like your model number are under recall for a potential fire hazard due to water leaking through the heating element posts onto the wiring.
Your serial number must begin with the 2 letters listed . Below is the list of recall serial numbers: FL, GL, HL, LL, ML, VL, ZL, AM, DM, FM, GM, HM, LM, MM, RM, SM, TM, VM, ZM, AR, DR, FR, GR
Call the phone # below or check out GE recall website. What GE does is replace the element and gaskets, unless there is burnt or arcing visible on the wires, they may replace the dishwasher.

www.geappliances.com/products/recall
GE has determined that an electrical failure in the dishwasher's heating element can pose a fire hazard. GE will provide a free repair to all consumers with units affected by the recall. We ask that you not use your dishwasher until it is repaired and to disconnect the electric supply by shutting off the fuse or circuit breaker controlling it and inform all users of the dishwasher about the risk of fire.
Consumers who instead wish to replace their dishwasher with a new model can receive a rebate towards the purchase of certain new GE and Profile brand dishwashers. Consumers can use a rebate of $75 for the purchase of certain GE front-control plastic tub dishwashers, or a GE rebate of $100 for the purchase of certain GE front-control stainless tub dishwashers or GE Profile top control dishwashers. See the rebate form for eligible models.
GE is aware of 15 reports of dishwasher heating element failures, seven of which resulted in fire and smoke damage beyond the unit. No injuries have been reported.
The model and serial numbers are important, as not all dishwashers are included in the recall. Look at the inside on the front left side of the dishwasher tub to find the model and serial number.
This recall is being conducted in cooperation with the U.S. Consumer Product Safety Commission, which will also monitor the effectiveness of the recall program.
Recall Hotline
866-918-8760
Monday through Friday, 8 a.m. - 5 p.m. ET.
Before calling, have the model and serial numbers on hand.

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have to remove front cover. should be on data plate where air blows out.

Unfortunately, only the manufacturer would know what the Serial Number should be.

My Tamron 18-270 has number at bottom side toward tripod hole(when lens is mounted on body)

just open the door on your lg and the serial number is on a tag.

Serial number will be something like:

804KWLL10010

(The first three numbers are a manufacture date code, the next two letters will be manufacture location code.)

Call Nero customer service at 818-956-7551

"Nero customer service can help you if you need assistance with lost serial numbers, rebate inquiries, basic non-troubleshooting issues regarding the Nero installation process, questions about purchases, and requesting replacement installer disc."

Hope this helps - remember to rate :)

The serial number should be on the box it came in :) I'm sure its on the board to, typically located on the LPT port (or whatever they have replaced it with)